from http://www.eecis.udel.edu/~mills/ntp/servers.html, http://www.eecis.udel.edu/~mills/ntp.html, and NTP Servers at http://support.ntp.org/bin/view/Servers/WebHome

Public NTP Secondary (stratum 2) Time Servers

Pogo, Walt Kelly

Please send corrections or additions to David Mills <mills@udel.edu> in HTML format as used in the list pages. If an error is found by other than the responsible person, please first request that person to submit the correction. See Public NTP Time Servers for the rules of engagement and general conditions of use.

Note that the lists are updated frequently, so please do not cache them and please do not reveal links to the lists themselves. Note that the names of the lists are changed on a regular basis in order to discourage direct links.

The servers in this list are sorted first by country code, then state code (US only), then host name. Last update: 07:03 PM UTC Saturday, May 08, 2005

Active Servers

AR time.sinectis.com.ar (216.244.192.3)
Location: Sinectis S.A., Buenos Aires (Argentina)
Geographic Coordinates: 3432'S, 5820'W
Service Area: Argentina
Synchronization: NTP V3 secondary (stratum 2), i686/Linux
Access Policy: open access, please send a message to notify.
Contact: timekeeper@sinectis.com.ar
Note: time is an alias and the IP address may change, please use DNS.
AR tick.nap.com.ar (200.49.40.1)
Location: Network Access Point, Buenos Aires, Argentina
Synchronization: NTP V3 secondary (stratum 2), Cisco IOS
Service Area: Argentina
Access Policy: open access, please send a message to notify
Contact: Pablo J. Fritz (timekeeper2002@nap.com.ar)
Note: tick.nap.com.ar is a CNAME
AR tock.nap.com.ar (200.49.40.15)
Location: Network Access Point, Buenos Aires, Argentina
Synchronization: NTP V3 secondary (stratum 2), Cisco IOS
Service Area: Argentina
Access Policy: open access, please send a message to notify
Contact: Pablo J. Fritz (timekeeper2002@nap.com.ar)
Note: tock.nap.com.ar is a CNAME
AU ntp.saard.net (203.21.37.18)
Location: The University of Adelaide, Adelaide, South AUSTRALIA
Synchronization: NTP secondary (stratum 2), DEC 3000/300L OSF/1
Service Area: AARNet
Access Policy: open access
Contact: Lachlan Cameron Smith (lachlan.cameronsmith@adelaide.edu.au)
BE ntp1.belbone.be (195.13.23.5)
Location: Brussels, Belgium
Synchronization: xntpd (stratum 2), linux/unix
Service Area: European Union
Access Policy: open access
Contact: Belbone NOC (timemaster@belbone.be)
BE ntp2.belbone.be (195.13.1.153)
Location: Brussels, Belgium
Synchronization: xntpd (stratum 2), linux/unix
Service Area: European Union
Access Policy: open access
Contact: Belbone NOC (timemaster@belbone.be)
BR ntp.cais.rnp.br (200.144.121.33)
Location: Brazilian Research Network/Rede Nacional de Pesquisa (RNP)
Synchronization: NTP V4 Secondary (stratum 2), Sun SPARC10/Solaris,
Service Area: Brazil
Access Policy: Open access to stratum 2 and stratum 3 NTP servers. Please, send a mail to notify.
Contact: ntp-admin@cais.rnp.br
BR ntp.hiway.com.br (200.246.53.5)
Location: Brazil, SP, Valinhos (near Sao Paulo) Hiway Internet Provider Valinhos
Geographic Coordinates: 22:58:22.4S 47:00:19.7W / Alt +729m (GPS WGS84)
Synchronization: NTP V4 Secondary (stratum 2), Linux i586, NTPd v.4.1.71
Service Area: Brazil
Access Policy: Open access. Please, send a mail to notify.
Contact: Fernando Braghetto, webmaster@hiway.com.br, 55 19 38694300
Note: IP address are subject to change; use DNS
BR ntp.massayonet.com.br (200.254.135.2)
Location: Telemacro Sistemas e Serviços
Synchronization: NTP V4 Secondary (stratum 2), OpenBSD 3.4
Service Area: Brazil
Access Policy: Open access to stratum 2 and stratum 3 NTP servers. Please send a mail to notify Contact: ntp@massayonet.com.br
BR ntp.pop-pr.rnp.br (200.19.74.21)
Location: PoP-PR/Brazilian Research Network (RNP)
Synchronization: NTP V4 Secondary (stratum 2), IBM RS6000 - 43P-240 /Debian GNU Linux
Service Area: Brazil
Access Policy: Open access to stratum 2 server. Please, send a mail to notify.
Contact: ntp-admin@pop-pr.rnp.br
BR ntp.ufes.br (200.137.65.132)
Location: POP-ES Federal University of Espirito Santo / POP-ES
Universidade Federal do Espirito Santo (UFES)
Synchronization: NTP V4 Secondary (stratum 2), AIX 4
Service Area: Brazil
Access Policy: Open access to stratum 2 and stratum 3 NTP servers. Please, send a mail to notify.
Contact: ntp-admin@ufes.br
BR ntp1.pucpr.br (200.192.112.8)
Location: Brazilian / Pontificia Universidade Catolica do Parana
Synchronization: NTP V4 secondary (stratum 2),
Sun SPARC4/Solaris 7
Service =C1rea: Brazil
Access Policy:open access to stratum 2 server
Contact: ntp1@pucpr.br
CA ntp.cpsc.ucalgary.ca (136.159.2.2)
Location: University of Calgary, Calgary, Alberta, Canada
Synchronization: NTP V4 Secondary, i686/Solaris
Service Area: Canada
Access Policy: open access
Contact: Brad Arlt (timekeeper@cpsc.ucalgary.ca)
CA ntp1.cmc.ec.gc.ca
Location: Canadian Meteorological Centre, Dorval, Québec, Canada
Synchronization: NTP V4 secondary SGI/Unix
Service Area: Eastern Canada
Access Policy: open access
Contact: ( ntp-admin@cmc.ec.gc.ca)
CA ntp2.cmc.ec.gc.ca
Location: Canadian Meteorological Centre, Dorval, Québec, Canada
Synchronization: NTP V4 secondary SGI/Unix
Service Area: Eastern Canada
Access Policy: open access
Contact: ( ntp-admin@cmc.ec.gc.ca)
CA tick.utoronto.ca (128.100.103.252)
Location: University of Toronto, Toronto, Ontario, CANADA
Synchronization: NTP V3 secondary (stratum 2), Sparc 10, Solaris 2.5.1
Service Area: Eastern Canada
Access Policy: open access, send email to notify.
Contact: Russell Sutherland (russ@madhaus.cns.utoronto.ca)
Note: IP addresses are subject to change; please use DNS
CA time.chu.nrc.ca (209.87.233.53)
Location: National Research Council of Canada, Ottawa, Ontario, Canada
Geographic Coordinates: 45:17:41N, 75:45:27W
Synchronization: NTP V3 secondary (stratum 2), PC/Linux
Service Area: Canada
Access Policy: open access
Contact: time@nrc.ca
Note: IP address subject to change; please use DNS.
CA time.nrc.ca (132.246.168.148)
Location: National Research Council of Canada, Ottawa, Ontario, Canada
Geographic Coordinates: 45:27N, 75:37W
Synchronization: NTP V3 secondary (stratum 2), PC/Linux
Service Area: Canada
Access Policy: open access
Contact: time@nrc.ca
Note: time is an alias and the IP address may change; please use DNS.
CA timelord.uregina.ca (142.3.100.15)
Location: University of Regina, Regina, Saskatchewan, Canada
Geographic Coordinates: 50:25N , 104:35:20 W
Synchronization: NTP V3 secondary (stratum 2), Sun Sparc 5
Service Area: SASK#net, CA*net, Canada
Access Policy: open access
Contact: Mark Haidl (timekeeper@uregina.ca)
Note: please limit to one or two hosts per site.
CA tock.utoronto.ca (128.100.100.128)
Location: University of Toronto, Toronto, Ontario, CANADA
Synchronization: NTP V3 secondary (stratum 2), Sparc 5, Solaris 2.5
Service Area: Eastern Canada
Access Policy: open access, send email to notify.
Contact: Russell Sutherland (russ@madhaus.cns.utoronto.ca)
Note: IP addresses are subject to change; please use DNS
CZ ntp.cgi.cz (81.0.239.181)
Location: Prague, The Czech Republic
Synchronization: NTP V4 secondary (stratum 2), PC/FreebSD
Service Area: Czech Republic
Access Policy: open access
Contact: Jakub Chromy (helpdesk@cgi.cz)
Note: ntp is an alias and the IP address may change; please use DNS.
CZ ntp.globe.cz (81.95.96.3)
Location: Prague, The Czech Republic
Synchronization: NTP V4 secondary (stratum 2), PC/Linux
Service Area: Czech Republic
Access Policy: open access
Contact: Jan Panoch (panoch.jan@globe.cz)
Note: ntp is an alias and the IP address may change; please use DNS.
CZ ntp.karpo.cz (217.11.227.68)
Location: Prague, The Czech Republic
Synchronization: NTP V4 secondary (stratum 2), PC/Linux
Service Area: Czech Republic
Access Policy: open access
Contact: Karel Zvara (zvara@karpo.cz)
Note: ntp is an alias and the IP address may change; please use DNS.
CZ ntp1.contactel.cz (212.65.193.3)
Location: Prague, The Czech Republic
Synchronization: NTP V4 secondary (stratum 2), PC/Linux
Service Area: Czech Republic
Access Policy: open access
Contact: Contactel hostmasters (hostmaster@ctt.cz)
Note: ntp1.contactel.cz is an alias and the IP address may change; please use DNS.
CZ ntp2.contactel.cz (212.65.193.4)
Location: Prague, The Czech Republic
Synchronization: NTP V4 secondary (stratum 2), PC/Linux
Service Area: Czech Republic
Access Policy: open access
Contact: Contactel hostmasters (hostmaster@ctt.cz)
Note: ntp1.contactel.cz is an alias and the IP address may change; please use DNS.
DE tick.fh-augsburg.de (141.82.30.251)
Location: Augsburg University of Applied Sciences (FH), Augsburg, Bavaria, Germany
Synchronization: NTP V3 secondary (stratum 2), i486/Linux
Service area: Germany, Europe, European academic community
Access policy: please check the details at our website
Contact: Burkhard Erdlenbruch (erd@rz.fh-augsburg.de)
DE tock.fh-augsburg.de (141.82.30.252)
Location: Augsburg University of Applied Sciences (FH), Augsburg, Bavaria, Germany
Synchronization: NTP V3 secondary (stratum 2), i486/Linux
Service area: Germany, Europe, European academic community
Access policy: please check the details at our website
Contact: Burkhard Erdlenbruch (erd@rz.fh-augsburg.de)
DE tack.fh-augsburg.de (141.82.30.253)
Location: Augsburg University of Applied Sciences (FH), Augsburg, Bavaria, Germany
Synchronization: NTP V4 secondary (stratum 2), i486/Linux
Service area: Germany, Europe, European academic community
Access policy: please check the details at our website
Contact: Burkhard Erdlenbruch (erd@rz.fh-augsburg.de)
ES hora.oxixares.com [217.127.2.161]
Location: Ogijares (Granada/SPAIN)
Synchronization: ntp v4.1.1 secondary (stratum 2)/athlon XP 2500+/SuSE Linux 8.2
Service Area: Spain
Access Policy: Public (glad to receive a note)
Contact: timekeeper@oxixares.com
ES slug.ctv.es [194.179.52.14] (will add an alias for this purpose)
Location: Altea (Alicante/SPAIN)
Synchronization: Stratum-2/i486DX2/66/Linux
Service Area: Spain
Access Policy: Public (glad to receive a note)
Contact: Luis Colorado (luis.colorado@slug.ctv.es)
FI tick.keso.fi (194.137.39.67)
Location: Keski-Savon Oppimiskeskus, Pieksamaki, Finland, Europe
Synchronization: NTP-3, i686/Linux
Service area: Finland
Access policy: open access, please send a message to notify
Contact: root@keso.fi
Note: tick is an alias, please use DNS
FI tock.keso.fi (194.137.39.68)
Location: Keski-Savon Oppimiskeskus, Pieksamaki, Finland, Europe
Synchronization: NTP-3, i586/Linux
Service area: Finland
Access policy: open access, please send a message to notify
Contact: root@keso.fi
Note: tock is an alias, please use DNS
FR ntp.ndsoftwarenet.com
Location: NDSoftware, Paris, France
Synchronization: NTP secondary (stratum 2)
Service area: World
Access policy: open access, please send a message to notify
Contact: NDSoftware NTPmaster (ntpmaster@ndsoftwarenet.com)
Note: IP address subject to change; please use DNS.
FR ntp.obspm.fr
Location: BNM-SYRTE, Observatoire de Paris, Paris, France
Synchronization: NTP V4 secondary (stratum-2), i386/Linux
Service Area: France/Europe
Access Policy: open access, but please send a message to notify
Contact: info.bnm-syrte@obspm.fr, More Informations?
Note: use DNS for IP address.
FR ntp.tuxfamily.net
Location: SFINX or TeleHouse2, Paris, France
Synchronization: NTP V4 secondary (stratum-2), Debian GNU/Linux ix86
Service Area: France/Europe
Access Policy: open access, no need to notify
Contact: ntp-adm@tuxfamily.net, More Informations ?
Note: use DNS for IP address
Note: ntp.tuxfamily.net is an alias for ntp1.tuxfamily.net and ntp2.tuxfamily.net
Note: see ntp{1,2}.tuxfamily.net entries for more information
FR ntp1.tuxfamily.net (80.67.177.2)
Location: SFINX, Paris, France
Synchronization: NTP V4 secondary (stratum-2), Debian GNU/Linux ix86
Service Area: France/Europe
Access Policy: open access, no need to notify
Contact: ntp-adm@tuxfamily.net, More Informations ?
Note: use DNS for IP address is recommended
Note: peer with ntp2.tuxfamily.net
Note: If you use this service reguraly, you should subscribe to ntp@tuxfamily.org
FR ntp2.tuxfamily.net (80.67.179.2)
Location: TeleHouse2, Paris, France
Synchronization: NTP V4 secondary (stratum-2), Debian GNU/Linux ix86
Service Area: France/Europe
Access Policy: open access, no need to notify
Contact: ntp-adm@tuxfamily.net, More Informations ?
Note: use DNS for IP address is recommended
Note: peer with ntp1.tuxfamily.net
Note: If you use this service reguraly, you should subscribe to ntp@tuxfamily.org
FR ntp.univ-lyon1.fr (134.214.100.6)
Location: CISM, Lyon, France
Synchronization: NTP V3 secondary (stratum 2), Sun SS10
Service Area: France, Switzerland, Italy, Europe
Access Policy: open access
Contact: ntp-adm@univ-lyon1.fr
Note: consult DNS to get host address, ntp is an alias.
Note: we would appreciate getting a little note if you make regular use of this server, so that we can put you on our NTP mailing-list.
FR ntp.via.ecp.fr (138.195.130.71)
Location: VIA, Ecole Centrale Paris, France
Synchronization: ntp v4.0.99c (stratum 2), Debian GNU/Linux x86
Service Area: France/Europe
Policy: open access, send email to notify. Please limit access to one or two hosts per site (large sites should set up their own ntp server)
Contact: ntpadmin@via.ecp.fr
GR ntp.mfa.gr (193.92.123.152)
Location: Athens, GR
Service Area: Greece
Synchronization: NTP V3 secondary (stratum 2), i686/FreeBSD
Access Policy: open access/GR, please send a message to notify.
Contact: ntp@mfa.gr
Note: "ntp" is an alias and the IP address may change, please use DNS.
GR ntp.mikros.com (213.5.174.2)
Location: Argostoli, Kefalonia, GR
Geographic Coordinates: 3810N 2030E
Service Area: Greece
Synchronization: NTP V3 secondary (stratum 2), i686/Linux
Access Policy: open access/GR, please send a message to notify.
Contact: ntp@mikroskosmos.com
Note: "ntp" is an alias and the IP address may change, please use DNS.
HK ntp.cuhk.edu.hk
Location: The Chinese University of Hong Kong.
Geographic Coordinates: 22:25:10N, 114:12:22E
Synchronization: NTP V3 secondary (stratum 2), i686/Linux
Service Area: Hong Kong, Taiwan, China, and South East Asia
Access Policy: open access
Contact: Connie Law (connieL@cuhk.edu.hk), <kinming@cuhk.edu.hk> Note: IP addresses are subject to change; please use DNS
HR zg1.ntp.carnet.hr (161.53.2.70)
Location: CARNet (Croatian Academic and Research Network), Zagreb, Croatia
Synchronization: NTP V4 secondary (stratum 2), Sun Sparc/Solaris
Service Area: Croatia/Europe
Access Policy: open access, glad to receive a note
Contact: ntp@carnet.hr
Note: IP address subject to change; better use DNS
HR zg2.ntp.carnet.hr (161.53.123.4)
Location: CARNet (Croatian Academic and Research Network), Zagreb, Croatia
Synchronization: NTP V4 secondary (stratum 2), Sun Sparc/Solaris
Service Area: Croatia/Europe
Access Policy: open access, glad to receive a note
Contact: ntp@carnet.hr
Note: IP address subject to change; better use DNS
HR st.ntp.carnet.hr (161.53.30.3)
Location: CARNet (Croatian Academic and Research Network), Split, Croatia
Synchronization: NTP V4 secondary (stratum 2), Sun Sparc/Solaris
Service Area: Croatia/Europe
Access Policy: open access, glad to receive a note
Contact: ntp@carnet.hr
Note: IP address subject to change; better use DNS
HR ri.ntp.carnet.hr (161.53.40.3)
Location: CARNet (Croatian Academic and Research Network), Rijeka, Croatia
Synchronization: NTP V4 secondary (stratum 2), Sun Sparc/UNIX
Service Area: Croatia/Europe
Access Policy: open access, glad to receive a note
Contact: ntp@carnet.hr
Note: IP address subject to change; better use DNS
HR os.ntp.carnet.hr (161.53.200.8)
Location: CARNet (Croatian Academic and Research Network), Osijek, Croatia
Synchronization: NTP V4 secondary (stratum 2), Sun Sparc/Solaris
Service Area: Croatia/Europe
Access Policy: open access, glad to receive a note
Contact: ntp@carnet.hr
Note: IP address subject to change; better use DNS
HU time.kfki.hu (148.6.0.1)
Location: KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
Synchronization: NTP secondary (stratum 2), Sun/Solaris
Service Area: HUNGARNET
Access Policy: open access, send email to notify.
Contact: time@sunserv.kfki.hu
ID ntp.incaf.net (202.180.0.71)
Location: Jakarta, Indonesia
Synchronization: NTP V4 Secondary, i686/Linux
Service Area: Indonesia
Access Policy: open access
Contact: admin (timekeeper@incaf.net)
IE ntp.maths.tcd.ie
Location: School of Mathematics, Trinity College, Dublin, Ireland.
Synchronization: NTPV4 secondary (stratum 2), Intel, FreeBSD 2.2
Service Area: Ireland, UK
Access Policy: open access, please send a message to notify.
Contact: time@maths.tcd.ie
Note: ntp.cs.tcd.ie, ntp.maths.tcd.ie and ntp.tcd.ie peer together over local area net. It is normally sufficient just to pick one machine to peer with.
IT ntps.net4u.it (80.83.192.129)
Location: 4u Srl, Vercelli, Italy
Synchronization: NTP secondary (stratum 2), Linux 2 on Intel PIII 500MHz
Service area: Italy
Access policy: open access, please send a message to notify
Contact: timemaster@net4u.it
JP ntp.cyber-fleet.net
Location: Cyber Fleet, Inc., Tokyo, Japan
Geographic Coordinates: 35:43:59N, 139:40:50E
Synchronization: NTP V4 secondary (stratum 2), PC BSD/OS
Service Area: Japan/East Asia
Access policy: open access, please send a message to notify
Contact: pdp@cyber-fleet.net
Note: the IP address may change, please use DNS
Note: IPv4/IPv6 available.
KR ntp.ewha.net [211.39.143.103]
Location: KT-IDC, Bundang, Korea
Geographic Coordinates: 37:24:45.3N 127:07:28.5E (WGS 84)
Synchronization: NTP V3 (stratum 2), i586/Linux
Service area: Korea
Access policy: Open access within Korea, send email to notify. Please limit access to one or two hosts per site (large sites should set up their own ntp server)
Contact: ntp@ewha.net
Note: IP addresses are subject to change; please use DNS
MX ntp2a.audiotel.com.mx (200.34.146.67)
Location: Audiotel office, Mexico D.F., Mexico
Synchronization: NTP V3 secondary (stratum 2), NeXTstation/33
Service Area: Avantel, MCINet, Mexico
Access Policy: open access, but please send a message to notify.
Contact: Pedro Resendiz (resendiz@audiotel.com.mx)
MX ntp2b.audiotel.com.mx (200.34.146.68)
Location: Audiotel office, Mexico D.F., Mexico
Synchronization: NTP V3 secondary (stratum 2), NeXTstation/33
Service Area: Avantel, MCINet, Mexico
Access Policy: open access, but please send a message to notify.
Contact: Pedro Resendiz (resendiz@audiotel.com.mx)
MX ntp2c.audiotel.com.mx (200.34.146.69)
Location: Audiotel office, Mexico D.F., Mexico
Synchronization: NTP V3 secondary (stratum 2), NeXTstation/33
Service Area: Avantel, MCINet, Mexico
Access Policy: open access, but please send a message to notify.
Contact: Pedro Resendiz (resendiz@audiotel.com.mx)
MY ntp.doubleukay.com
Location: Cyberjaya, Malaysia
Synchronization: NTP V4 secondary (stratum 2), Intel/Linux
Service Area: Malaysia
Access Policy: open access
Contact: Woon Wai Keen (timekeeper@doubleukay.com)
NG ntp.supernet300.com (216.72.109.4)
Location: Supernet300, Lagos, Nigeria
Synchronization: NTP secondary (stratum 2), PC/Linux
Service Area: Western Africa, primarily Nigerian NITEL backbone
Access Policy: Open access, please send an email to notify before use.
Contact: timelords@supernet300.com
Note: Please use the DNS name-the IP address can (and likely will) change.
NL ntp1.theinternetone.net (62.4.94.221)
Location: The Internetone, Abovenet Amsterdam, The Netherlands
Synchronization: NTP V4 secondary (stratum 2), i686/Linux
Service Area: Netherlands/Europe, Abovenet
Access Policy: open access, please send a message to notify
Contact: Cees de Groot (cg@theinternetone.net)
Note: please choose one of ntp{1,2,3}.theinternetone.net. Use DNS, addresses subject to change
NL ntp2.theinternetone.net (62.4.94.8)
Location: The Internetone, Abovenet Amsterdam, The Netherlands
Synchronization: NTP V4 secondary (stratum 2), i686/Linux
Service Area: Netherlands/Europe, Abovenet
Access Policy: open access, please send a message to notify
Contact: Cees de Groot (cg@theinternetone.net)
Note: please choose one of ntp{1,2,3}.theinternetone.net. Use DNS, addresses subject to change
NL ntp3.theinternetone.net (62.4.94.210)
Location: The Internetone, Abovenet Amsterdam, The Netherlands
Synchronization: NTP V4 secondary (stratum 2), i686/Linux
Service Area: Netherlands/Europe, Abovenet
Access Policy: open access, please send a message to notify
Contact: Cees de Groot (cg@theinternetone.net)
Note: please choose one of ntp{1,2,3}.theinternetone.net. Use DNS, addresses subject to change
NO fartein.ifi.uio.no (129.240.64.3)
Location: University of Oslo, Norway
Geographic Coordinates: 59:56:32N, 10:43:22E
Synchronization: NTP secondary (stratum 2), DEC Alpha OSF/1 V4.0
Service Area: NORDUnet
Access Policy: open access
Contact: timekeeper@ifi.uio.no)
NO time.alcanet.no (use DNS)
Location: Alcanet International, Oslo, Norway
Synchronization: NTP V3 secondary (stratum 2), PC/Linux
Service Area: Europe=20
Access Policy: open access, notify message appreciated
Contact: timekeeper@alcanet.no
NZ ntp.iprolink.co.nz (use DNS)
Location: Iprolink, CBD, Auckland, New Zealand
Geographic coordinates: 36:50:59.6 S, 174:45:31.9 E, (GPS NZ Geodatum 1949)
Synchronisation: NTP V3 (stratum 2), Cisco Router
Service Area: New Zealand
Access Policy: Open access within New Zealand, send email to notify.
Contact: ntp@iprolink.co.nz
Note: IP addresses are subject to change; please use DNS
NZ ntp.massey.ac.nz (Use DNS)
Location: Massey University, Palmerston North, New Zealand
Synchronisation: NTP V4 (stratum 2), PC/Linux
Service Area: New Zealand
Access Policy: Open access within New Zealand
Contact: ntp@massey.ac.nz
Note: if multiple servers are required, use ntp1 and ntp2
NZ ntp.public.otago.ac.nz (139.80.64.114)
Location: University of Otago, Dunedin, New Zealand
Synchronisation: NTP V3 (stratum 2), Linux on Intel
Service Area: New Zealand
Access Policy: Open access within New Zealand, send email to notify.
Contact: ntp@otago.ac.nz
Note: IP addresses are subject to change; please use DNS
NZ tk1.ihug.co.nz, tk2.ihug.co.nz, tk3.ihug.co.nz (use DNS)
Location: ihug, Central city, Auckland, New Zealand
Synchronisation: NTP V4 (stratum 2), PC/Linux
Service Area: New Zealand
Access Policy: Open access within New Zealand, send email to notify.
Contact: ntp@staff.ihug.co.nz
Note: IP addresses are subject to change; please use DNS
PL info.cyf-kr.edu.pl: 149.156.4.11
Location: Academic Computer Centre, CYFRONET, Krakow, Poland
Synchronization: NTP V3 secondary (stratum 2), HP/Unix
Service Area: Poland/Europe
Access policy: open access, please send a message to notify
Contact: Jerzy.Pawlus@cyf-kr.edu.pl
PT bug.fe.up.pt (193.136.54.1)
Location: Oporto University, Portugal
Synchronization: NTP secondary (stratum 2), i486/Linux
Service Area: Portugal/Europe
Access Policy: For use only by prior arrangement. Mail
timemaster@bug.fe.up.pt for more information.
RO ntp.ip.ro (212.93.129.107)
Location: IP Bucharest, Romania
Synchronization: NTP V3, Linux/i586
Service Area: Romania/Europe
Access Policy: open access, but please send a message to notify
Contact: ntp@ntp.ip.ro
Note: use DNS for IP address.
RU ntp.psn.ru (194.149.67.130)
Location: Pushchino, Moscow region, Russia
Geographic Coordinates: 54:50N, 37:37E
Synchronization: NTP secondary (stratum 2), Alpha/Linux
Service area: Russia
Access policy: open access, please send a message to notify
Contact: clockmaster@psn.ru
RU sign.chg.ru (193.233.46.10)
Location: Scientific Center in Chernogolovka, Moscow region, Russia
Synchronization: NTP V3 secondary (stratum 2), PC/FreeBSD 3.1
Service Area: Russia
Access Policy: open access, please send e-mail to notify.
Contact: Andrew Neporada (andrew@chg.ru) or time@sign.chg.ru
SE ntp.lth.se (130.235.20.3)
Location: Lund Institute of Technology, Lund, Sweden
Synchronization: NTP V3 secondary (stratum 2), Sun/Solaris
Service Area: Sweden, NORDUnet
Access Policy: open access, send email to notify. Please limit access to one or two hosts per site (large sites should set up their own ntp server)
Contact: timemaster@lth.se
SE time.flygplats.net
Location: flygplats.net, Sigtuna, Sweden
Synchronization: NTP V4 secondary, i386, FreeBSD
Service Area: Europe
Access Policy: Open access
Contact: timekeeper;@flygplats.net
Note: IP address subject to change; please use DNS.
SG ntp.shim.org
Location: Singapore
Synchronization: NTP secondary (stratum 2), Intel/Linux
Service Area: Singapore
Access Policy: open access
Contact: Dr Ivan Shim
SI biofiz.mf.uni-lj.si (193.2.69.10)
Location: Institute of Biophysics, University of Ljubljana, Slovenia
Geographic Coordinates: 46:03:09N, 14:30:40E
Synchronization: NTP V4 secondary (stratum 2), IBM/Linux
Service Area: Slovenia/Europe
Access Policy: open access, please send a message to notify
Contact: Primoz Peterlin (time@biofiz.mf.uni-lj.si)
SI ntp1.arnes.si (193.2.1.66)
Location: ARNES (Academic and Research Network of Slovenia), Ljubljana, Slovenia
Synchronization: NTP V4 secondary (stratum 2), Sun Sparc/Solaris
Service Area: Slovenia/Europe
Access Policy: open access with some restrictions (see http://www.arnes.si/english/ntp_access.html)
Contact: ntp-admin@arnes.si
Note: IP address subject to change; better useDNS
SI ntp2.arnes.si (193.2.1.92)
Location: ARNES (Academic and Research Network of Slovenia), Ljubljana, Slovenia
Synchronization: NTP V4 secondary (stratum 2), Sun Sparc/Solaris
Service Area: Slovenia/Europe
Access Policy: open access with some restrictions (see http://www.arnes.si/english/ntp_access.html)
Contact: ntp-admin@arnes.si
Note: IP address subject to change; better use DNS
SI time.ijs.si (193.2.4.6)
Location: J. Stefan Institute, Ljubljana, Slovenia
Geographic Coordinates: 46:02:35N, 14:29:17E (WGS84)
Synchronization: NTP V4 secondary (stratum 2), DEC Alpha / Digital Unix
Service Area: Slovenia/Europe
Access Policy: open access, glad to receive a note
Contact: Mark Martinec (timekeeper@ijs.si)
Note: IP address subject to change; better use DNS
SI time.ijs.si (193.2.4.6)
Location: J. Stefan Institute, Ljubljana, Slovenia
Geographic Coordinates: 46° 2.517'N, 14° 29.241'E (WGS84)
Synchronization: NTP V4 secondary (stratum 2), Compaq (DEC) Alpha / Tru64 Unix with MICRO_TIME kernel option
Service Area: Slovenia/Europe
Access Policy: open access, glad to receive a note
Contact: Mark Martinec (timekeeper@ijs.si); More info?
Note: IP address subject to change; better use DNS
SV clock.cimat.ues.edu.sv (168.243.7.66)
Location: Faculty of Natural Sciences and Mathematics, University of El Salvador, San Salvador, El Salvador
Synchronization: NTP V4 secondary (stratum 2), PC/Linux
Service Area: Central America
Access Policy: open access, please send a message to notify
Contact: (admin@cimat.ues.edu.sv)
Note: clock.cimat.ues.edu.sv is a CNAME
UK a.ntp.alphazed.net (212.42.1.207)
Location: Telehouse, London E14
Synchronization: NTP 4, FreeBSD
Service Area: all areas
Access Policy: open access
Contact: ntp@alphazed.com
Note: Please check http://www.alphazed.co.uk/support/ntp.php
TR time.deu.edu.tr (193.140.151.9)
Location: Dokuz Eylul University, Izmir, Turkey
Synchronization: NTP V4 Secondary (stratum 2), Sun SPARC10/Solaris,
Service Area: Turkey
Access Policy: Open access Please, send a mail to notify.
Contact: berent@deu.edu.tr
Note: IP address are subject to change; please use DNS
UK bear.zoo.bt.co.uk (132.146.236.132)
Location: BT Adastral Park, Ipswich, England
Synchronisation: NTP Secondary, PentiumIII/Linux 2.4
Service Area: UK
Access Policy: Open Access
Contact: John Sager, jcs@zoo.bt.co.uk
Note: WYSIWYG. No service guarantee, so don't use it as your sole sync source.
UK ntp.cis.strath.ac.uk
Location: Dept. Computer and Information Sciences, University of Strathclyde, Glasgow, Scotland.
Geographic Coordinates: 04:14W, 55:52N
Synchronization: NTP V4 secondary
Service Area: UK/Europe
Access Policy: open access
Contact: Ian Gordon (ntp@cis.strath.ac.uk)
Note: Do not use IP address because these can change
UK ntp.exnet.com (194.207.34.9)
Location: ExNet Ltd, London, UK
Synchronization: NTP secondary (stratum 2), Sun-4/Unix
Service area: UK/Europe/any
Access policy: semi-open access, please send message first for access
Contact: sysadmin@exnet.com or dhd@exnet.com
Note: Please see our Web page before using. Please use CNAME ntp.exnet.com since IP address may well change.
UK ntp2a.mcc.ac.uk (130.88.202.49)
Location: University of Manchester, Manchester, England
Synchronization: NTP secondary (S2), Sun/SunOS
Service Area: UK
Access Policy: Open Access
Contact(s): timelords@mcc.ac.uk
Note: Please use DNS for address, subject to change
UK ntp2b.mcc.ac.uk (130.88.200.98)
Location: University of Manchester, Manchester, England
Synchronization: NTP secondary (S2), PC/FreeBSD
Service Area: UK
Access Policy: Open Access
Contact(s): timelords@mcc.ac.uk
Note: Please use DNS for address, subject to change
UK ntp2c.mcc.ac.uk (130.88.200.4)
Location: University of Manchester, Manchester, England
Synchronization: NTP secondary (S2), PC/FreeBSD
Service Area: UK
Access Policy: Open Access
Contact(s): timelords@mcc.ac.uk
Note: Please use DNS for address, subject to change
UK ntp2d.mcc.ac.uk (130.88.203.12)
Location: University of Manchester, Manchester, England
Synchronization: NTP secondary (S2), SGI/Irix
Service Area: UK
Access Policy: Open Access
Contact(s): timelords@mcc.ac.uk
Note: Please use DNS for address, subject to change
UK ntp{0|1|2}.sandvika.net (194.164.127.{4|5|6})
Location: Telehouse Europe, London E14.
Geographic Coordinates: 51°30.71'N 0°00.08'W
Synchronisation: NTP V4 secondary Sun UltraSPARC Solaris 8
Service area: UK / Europe
Contact: time@sandvika.net
Note: www.sandvika.net/time (ntp2 new - due online mid-October 2002).
UK ntp0.uk.uu.net 158.43.128.33
Configuration: NTP V3 secondary (stratum 2), Sun sparc Ultra, Solaris 7, xntpd 3-5.93
Location: Cambridge, UK
Service Area: UUNET (formerly known in the UK as PIPEX); UK
Access Policy: Semi-open access. These are primarily for use by UUNET customers who may use them without asking, but others are welcome to peer if they give notice.
Contact: timelord@uk.uu.net
Note: This service is supported on a best-effort basis, but is not guaranteed. UUNET customers should peer with all three: ntp0.uk.uu.net, ntp1.uk.uu.net, and ntp2.uk.uunet.
UK ntp1.uk.uu.net 158.43.128.66
Configuration: NTP V3 secondary (stratum 2), Sun sparc Ultra, Solaris 7, xntpd 3-5.93
Location: Cambridge, UK
Service Area: UUNET (formerly known in the UK as PIPEX); UK
Access Policy: Semi-open access. These are primarily for use by UUNET customers who may use them without asking, but others are welcome to peer if they give notice.
Contact: timelord@uk.uu.net
Note: This service is supported on a best-effort basis, but is not guaranteed. UUNET customers should peer with all three: ntp0.uk.uu.net, ntp1.uk.uu.net, and ntp2.uk.uunet.
UK ntp2.uk.uu.net 158.43.192.66
Configuration: NTP V3 secondary (stratum 2), Sun sparc Ultra, Solaris 7, xntpd 3-5.93
Location: London, UK
Service Area: UUNET (formerly known in the UK as PIPEX); UK
Access Policy: Semi-open access. These are primarily for use by UUNET customers who may use them without asking, but others are welcome to peer if they give notice.
Contact: timelord@uk.uu.net
Note: This service is supported on a best-effort basis, but is not guaranteed. UUNET customers should peer with all three: ntp0.uk.uu.net,
UK tick.tanac.net (195.112.34.51)
Location: Wibble UK, Aylesbury, Buckinghamshire UK
Synchronization: NTP secondary (stratum 2), i686/Linux 2.2
Geographic Coordinates: 51 49 00 N 00 48 00 W
Service area: United Kingdom
Access policy: open access, please send a message to notify
Contact: ntp@tanac.net
UK; time-server.ndo.com (195.7.224.135)
Location: Telehouse Metro, London EC2A.
Geographic Coordinates: 51°31.21'N 0°05.01'W
Synchronisation: NTP secondary, PC/Debian Linux
Service area: UK / Europe
Access Policy: Open Access
Contact: support@ndo.com
US * time.cachenetworks.com (no address, please use dns)
Location: Multiple, United States
Synchronization: NTP V4 secondary (stratum 2)
Service area: US/any
Access policy: open access, please send a message to notify
Contact: Matt Levine (matt.levine@cachenetworks.com)
Note: service is (unicast) anycasted in multiple locations.
US AR sushi.compsci.lyon.edu (150.208.72.154)
Location: Lyon College Computer Science (Batesville, Arkansas USA)
Geographic Coordinates: 35.776N, 91.629W
Service Area: United States
Synchronization: NTP V4 secondary (stratum 2)
Access Policy: open access, please send a message to notify.
Contact: Matt Critcher (timekeeper@compsci.lyon.edu)
Note: IP's may change. Please use DNS.
US AZ decimal.lib.ci.phoenix.az.us (148.167.132.201)
Location: Phoenix, AZ
Synchronization: NTP V4 secondary (stratum 2) P-III/Linux 2.4
Service Area: North America
Access Policy: Open access. Please limit access to one or two hosts per site (large sites should set up their own ntp server)
Contact: timekeeper@phxlib.org
US AZ dewey.lib.ci.phoenix.az.us (148.167.132.200)
Location: Phoenix, AZ
Synchronization: NTP V4 secondary (stratum 2) P-III/Linux 2.4
Service Area: North America
Access Policy: Open access. Please limit access to one or two hosts per site (large sites should set up their own ntp server)
Contact: timekeeper@phxlib.org
US AZ ntp.drydog.com (207.211.160.111)
Location: Tempe, AZ
Synchronization: NTP V4 secondary (stratum 2) P-III/Linux 2.4
Service Area: Western United States and Northern Mexico
Access Policy: open access, please send a message to notify. Please limit access to one or two hosts per site (large sites should set up their own ntp server)
Contact: Dan Anderson ( timekeeper@drydog.com)
US CA clock.fmt.he.net (216.218.192.202)
Location: Hurricane Electric, Fremont, California
Synchronization: NTP V4 primary (GPS), Symmetricom NTS-150
Service Area: all areas
Access Policy: open access
Contact: support@he.net
US CA clock.sjc.he.net (216.218.254.202)
Location: Hurricane Electric, San Jose, California
Synchronization: NTP V4 primary (CDMA), Endrun Praecis CNTP
Service Area: all areas
Access Policy: open access
Contact: support@he.net
US CA ntp.ucsd.edu (132.239.254.49)
Location: UCSD Academic Computing Services/Network Operations, San Diego, CA
Synchronization: NTP secondary (stratum 2)
Service Area: CERFNET; NSFNET, SDSC region and nearby
Access Policy: open access, please send a message to notify.
Contact: timekeeper@ucsd.edu
US CA ntp1.mainecoon.com (63.192.96.2)
Location: Quincy, California
Geographic Coordinates: 39:56.863N, 120:54.657W
Synchronization: NTP V4 secondary (stratum 2) P-II/X86 Solaris 2.7
Service Area: North America
Access Policy: Open Access, please drop us a note so we can add you to our mailing list.
Contact:time@mainecoon.com or Chris Kennedy (chris@mainecoon.com)
Note: ntp1 is a CNAME for time service. Please use DNS; IP assignments subject to change.
US CA ntp2.mainecoon.com (63.192.96.3)
Location: Quincy, California
Geographic Coordinates: 39:56.863N, 120:54.657W
Synchronization: NTP V4 secondary (stratum 2) Sun 4/75 Solaris 2.7
Service Area: North America
Access Policy: Open Access, please drop us a note so we can add you to our mailing list.
Contact:time@mainecoon.com or Chris Kennedy (chris@mainecoon.com)
Note: ntp2 is a CNAME for time service. Please use DNSUS
CA ntp1.sf-bay.org (207.126.97.57)
Location: San Jose, CA
Synchronization: NTP secondary (stratum 2), FreeBSD
Service Area: North America: Northern California and Pacific Northwest
Access Policy: open access, please send a message to notify
Contact: Scott Hazen Mueller (clockmaster@sf-bay.org)
US CA ntp2.sf-bay.org (204.74.68.55)
Location: Los Angeles, CA
Synchronization: NTP secondary (stratum 2), FreeBSD
Service Area: North America: Southern California
Access Policy: open access, please send a message to notify
Contact: Scott Hazen Mueller (clockmaster@sf-bay.org)
US CA ntp.ucsd.edu (132.239.254.49)
Location: UCSD Academic Computing Services/Network Operations, San Diego, CA
Synchronization: NTP secondary (stratum 2)
Service Area: CERFNET; NSFNET, SDSC region and nearby
Access Policy: open access, please send a message to notify.
Contact: timekeeper@ucsd.edu
US CA reloj.kjsl.com (204.87.183.6)
Location: Salinas, CA, USA
Synchronization: NTP V3 secondary (stratum 2), MultiNet on VMS
Service area: Western USA (Layer42 connectivity)
Access policy: open access, please drop me a note if you use the server so I can keep you on the notify list.
Contact: <timekeeper@kjsl.com>>
US CA time.berkeley.netdot.net (216.27.190.202)
Location: Berkeley, CA
Synchronization: NTP secondary (stratum 2), FreeBSD
Service Area: North America: Pacific Coast
Access Policy: open access, please send a message to notify
Contact: Caleb Haley (chaley@netdot.net)
Note: time.berkeley.netdot.net is a CNAME
US CA time.five-ten-sg.com (205.147.40.34)
Location: Lake Arrowhead, CA, USA
Synchronization: NTP V4 secondary (Stratum 2), Linux/intel
Service Area: within 100ms of Digilink.net
Access Policy: open access, email for firewall access first
Contact: carl@five-ten-sg.com
US CO ntp1.linuxmedialabs.com
Location: Linux Media Labs LLC, Colorado Springs, CO
Service Area: US
Synchronization: NTP Secondary (stratum 2), i686/Linux
Access Policy: open access
Contact: ntp@linuxmedialabs.com
Note: ntp1 is an alias and the IP address may change, please use DNS
US CO ntp1.tummy.com
Location: tummy.com, ltd., Fort Collins, CO
Service Area: US
Synchronization: NTP Secondary (stratum 2), i686/Linux
Access Policy: open access.
Contact: ntp@tummy.com
Note: ntp1 is an alias and the IP address may change, please use DNS.
US DE louie.udel.edu (128.4.40.12)
Location: University of Delaware, Newark, DE
Synchronization: NTP V3 secondary (stratum 2), Sun SPARC10/Solaris 2.6
Service Area: CAIRN, Abilene/vBNS
Access Policy: open access
Contact: Dave Mills <mills@udel.edu>
US GA ntp.shorty.com (208.21.108.186)
Location: CNSG, Atlanta, GA
Synchronization: NTP secondary (stratum 2), PC/Linux
Service Area: Southeast United States
Access Policy: Open access, please send an email to notify before use.
Contact: timelords@shorty.com
Note: Please use the CNAME ntp. IP addresses can (and likely will) change.
US GA rolex.usg.edu
Location: University System of Georgia NOC, Atlanta, GA
Synchronization: NTP secondary (stratum 2)
Service Area: PeachNet (Georgia)
Access Policy: open access, please send a message with the hostname and/or address of your NTP client to notify.
Contact: timekeeper@usg.edu
US GA timex.usg.edu
Location: University System of Georgia NOC, Atlanta, GA
Synchronization: NTP secondary (stratum 2)
Service Area: PeachNet (Georgia)
Access Policy: open access, please send a message with the hostname and/or address of your NTP client to notify.
Contact: timekeeper@usg.edu
US IL ntp-0.cso.uiuc.edu (130.126.24.53)
Location: University of Illinois, Urbana-Champaign, IL
Synchronization: NTP secondary (stratum 2), Cisco-ASM/4
Service Area: CICNET, Midwest, NCSA region
Access Policy: open access
Contact: Charley Kline (kline@uiuc.edu)
Note: select one of (ntp-0.cso.uiuc.edu, ntp-1.cso.uiuc.edu, ntp-2.cso.uiuc.edu) to equalize load. Use names rather than IP addresses if possible. The ntp-N aliases follow wherever the service is moved to.
US IL ntp-1.cso.uiuc.edu (130.126.24.24)
Location: University of Illinois, Urbana-Champaign, IL
Synchronization: NTP secondary (stratum 2), Cisco-ASM/4
Service Area: CICNET, Midwest, NCSA region
Access Policy: open access
Contact: Charley Kline (kline@uiuc.edu)
Note: select one of (ntp-0.cso.uiuc.edu, ntp-1.cso.uiuc.edu, ntp-2.cso.uiuc.edu) to equalize load. Use names rather than IP addresses if possible. The ntp-N aliases follow wherever the service is moved to.
US IL ntp-1.mcs.anl.gov (140.221.9.20)
Location: Argonne National Laboratory, near Chicago, IL
Synchronization: NTP V3 secondary (stratum 2), Sun Sparcstation
Service Area: NSF/ANSNet, CICNet, NetIllinois, ESNet, others welcome
Policy: open access, please send a message to notify
Contact: Systems Staff (ntp-contact@mcs.anl.gov)
Note: IP addresses are subject to change; please use DNS
US IL ntp-2.cso.uiuc.edu (130.126.24.44)
Location: University of Illinois, Urbana-Champaign, IL
Synchronization: NTP secondary (stratum 2), Cisco-ASM/4
Service Area: CICNET, Midwest, NCSA region
Access Policy: open access
Contact: Charley Kline (kline@uiuc.edu)
Note: select one of (ntp-0.cso.uiuc.edu, ntp-1.cso.uiuc.edu, ntp-2.cso.uiuc.edu) to equalize load. Use names rather than IP addresses if possible. The ntp-N aliases follow wherever the service is moved to.
US IL ntp-2.mcs.anl.gov (140.221.9.6)
Location: Argonne National Laboratory, near Chicago, IL
Synchronization: NTP secondary (stratum 2), Sun Sparcstation 2
Service Area: NSF/ANSNet, CICNet, NetIllinois, ESNet, others welcome
Access Policy: open access, please send a message to notify
Contact: Systems Staff (ntp-contact@mcs.anl.gov)
Note: IP addresses are subject to change; please use DNS
US IN gilbreth.ecn.purdue.edu (128.46.129.93, 128.46.141.93, 128.46.147.93, 128.46.148.93, 128.46.171.93)
Location: Purdue University Engineering Computer Network, West Lafayette, IN
Synchronization: NTP V3 secondary (stratum 2), Sun SPARCserver 1000/Solaris 2.3
Service area: NSFNET, CICNET area
Access policy: open access
Contact: Mike Moya (moyman@ecn.purdue.edu)
US IN harbor.ecn.purdue.edu (128.46.128.76, 128.46.129.76, 128.46.154.76)
Location: Purdue University Engineering Computer Network, West Lafayette, IN
Synchronization: NTP V3 secondary (stratum 2), Sun-4/75+/Solaris 2.3
Service area: NSFNET, CICNET area
Access policy: open access
Contact: Mike Moya (moyman@ecn.purdue.edu)
US IN horologe.cerias.purdue.edu(128.10.252.1)
Location: CERIAS, Purdue University, West Lafayette, IN
Synchronization: NTP V3/V4 stratum 2 server, Cisco router
Geographic Coordinates: 40:25:33.2N, 86:54:54.7W (GPS)
Service Area: Purdue University hosts only
Access Policy: open access to Purdue University addresses. Please see our ntp WWW page.
Contact: Gene Spafford ( ntp-request@cerias.purdue.edu)
Note: This host does not support "daytime" -- only UDP-based NTP.
US IN molecule.ecn.purdue.edu (128.46.129.95, 128.46.132.95, 128.46.136.95, 128.46.145.95, 128.46.167.95, 128.46.169.95, 128.46.181.95)
Location: Purdue University Engineering Computer Network, West Lafayette, IN
Synchronization: NTP V3 secondary (stratum 2), Sun SPARCserver 1000/Solaris 2.3
Service area: NSFNET, CICNET area
Access policy: open access
Contact: Mike Moya (moyman@ecn.purdue.edu)
US IN tick.cerias.purdue.edu(128.10.252.9), tock.cerias.purdue.edu(128.10.252.10)
Location: CERIAS, Purdue University, West Lafayette, IN
Synchronization: NTP V3/V4 stratum 2 servers
Geographic Coordinates: 40:25:33.2N, 86:54:54.7W (GPS)
Service Area: Internet2, CIC and midwest US
Access Policy: Open access but please see our ntp WWW page.
Contact: Gene Spafford ( ntp-request@cerias.purdue.edu)
Note: This host does not support "daytime" -- only UDP-based NTP.
US KS ntp1.kansas.net (199.240.130.1)
Location: KansasNet OnLine Services, Manhattan, KS
Synchronization: NTP V3 secondary (stratum 2), Linux on Intel
Service area: Central USA / Great Plains
Access policy: open access to ntp1.kansas.net *or* ntp2.kansas.net; customers may use both servers.
Contact: support@kansas.net
US KS ntp2.kansas.net (199.240.130.12)
Location: KansasNet OnLine Services, Manhattan, KS
Synchronization: NTP V3 secondary (stratum 2), Linux on Intel
Service area: Central USA / Great Plains
Access policy: open access to ntp1.kansas.net *or* ntp2.kansas.net; customers may use both servers.
Contact: support@kansas.net
US MA ntp.ourconcord.net (216.204.156.2)
Location: Concord, MA
Synchronization: NTP v4 stratum 2, Linux
Service Area: Eastern time zone
Access Policy: open access
Contact: Bruce Walker (timekeeper@quidnet.com)
US MN ns.nts.umn.edu (128.101.101.101)
Location: Minneapolis, MN
Synchronization: NTP secondary (stratum 2), Sun/SunOS 4.1.3
Service Area: CICNET region
Access Policy: open access, please send a message to notify.
Networking & Telecommunications Services (nts@nts.umn.edu)
Note: select one of ns.nts.umn.edu or nss.nts.umn.edu to equalize load
US MN nss.nts.umn.edu (134.84.84.84)
Location: St Paul, MN
Synchronization: NTP secondary (stratum 2), Sun/SunOS 4.1.3
Service Area: CICNET region
Access Policy: open access, please send a message to notify.
Networking & Telecommunications Services (nts@nts.umn.edu)
Note: select one of ns.nts.umn.edu or nss.nts.umn.edu to equalize load
US MO time-ext.missouri.edu (NO IP LISTED)
Location: University of Missouri-Columbia, Columbia, MO, USA
Synchronization: NTP secondary (stratum 2), Linux/Intel
Service Area: MOREnet
Access Policy: open access, please send a message to notify
Contact: time@missouri.edu
US MT chronos1.umt.edu (192.73.48.1)
Location: University of Montana, Missoula, Montana
Synchronization: NTP secondary (stratum 2), Cisco 7507
Service Area: Northwest USA, Internet 2
Access Policy: open access, please send message to notify
Contact: Michael Bloom (michaelb@selway.umt.edu)
Note: IP addresses are subject to change; please use DNS if possible
US MT chronos2.umt.edu (192.73.48.2)
Location: University of Montana, Missoula, Montana
Synchronization: NTP secondary (stratum 2), Cisco 7507
Service Area: Northwest USA, Internet 2
Access Policy: open access, please send message to notify
Contact: Michael Bloom (michaelb@selway.umt.edu)
Note: IP addresses are subject to change; please use DNS if possible
US MT chronos3.umt.edu (192.73.48.6)
Location: University of Montana, Missoula, Montana
Synchronization: NTP secondary (stratum 2), Cisco 7507
Service Area: Northwest USA, Internet 2
Access Policy: open access, please send message to notify
Contact: Michael Bloom (michaelb@selway.umt.edu)
Note: IP addresses are subject to change; please use DNS if possible
US NC clock1.unc.edu (152.2.21.1)
Location: University of North Carolina-Chapel Hill, Chapel Hill, NC
Geographic Coordinates: 35:54N, 79:03W
Synchronization: NTP secondary (stratum 2), Sun4/SunOS/xntpd (V3)
Service Area: CONCERT region
Access Policy: CONCERT region, others by prior arrangement
Contact: Timekeeper (timekeeper@clock1.unc.edu) NOTE: The default restriction on this host is "noserve". Hosts outside the service area must make prior arrangements to receive time service.
US NH ntp.uhfradio.com (64.35.195.62)
Location: Contoocook, NH
Synchronization: NTP V4 primary (GPS)Garmin16, Win2k/tac
Service Area: Eastern time zone
Access policy: Open access
Contact: admin@uhfradio.com
Note: IP addresses are subject to change; please use hostname. Important: Access policies subject to change if server is overloaded or abused. more info http://ntp.uhfradio.com
Contact: admin (admin@uhfradio.com)
US NJ tick.jrc.us (65.211.109.1)
Location: Jensen Research Corporation, Oakland NJ
Geographic Coordinates: 41 00.975 N, 74 15.262 W
Synchronization: NTP V3 secondary (stratum 2), Cisco 3620 IOS 12.2
Service Area: Eastern US
Access Policy: Open access; please send a message to notify.
Contact: JRC Network Ops (noc@jensenresearch.com) 201 337-4000
Note: IP addresses are subject to change; please use DNS.
US NJ tock.jrc.us (65.211.109.11)
Location: Jensen Research Corporation, Oakland NJ
Geographic Coordinates: 41 00.975 N, 74 15.262 W
Synchronization: NTP V4 secondary (stratum 2), Intel PIII/866 Win2K
Service Area: Eastern US
Access Policy: Open access; please send a message to notify.
Contact: JRC Network Ops (noc@jensenresearch.com) 201 337-4000
Note: IP addresses are subject to change; please use DNS.
US NV cuckoo.nevada.edu (131.216.1.101)
Location: University of Nevada System Computing Services, Las Vegas,NV
Synchronization: NTP V3 secondary (stratum 2), DEC Alpha/Unix
Service Area: NevadaNet, NSFNET, SDSC region
Access Policy: open access, please send message to notify
Contact: Systems Group (software@nevada.edu)
Note: cuckoo.nevada.edu is a CNAME for alphabits.nevada.edu
US NV tick.cs.unlv.edu (131.216.22.15)
Location: UNLV College of Engineering, Las Vegas, NV
Synchronization: NTP V4 secondary (stratum 2), Solaris
Service Area: Sprintnet
Access Policy: open access, an email note is appreciated
Contact: <grayaw@egr.unlv.edu>
Note: select one of tick.cs.unlv.edu or tock.cs.unlv.edu at random to equalize load
US NV tock.cs.unlv.edu (131.216.22.17)
Location: UNLV College of Engineering, Las Vegas, NV
Synchronization: NTP V4 secondary (stratum 2), Mips/Unix
Service Area: Sprintnet
Access Policy: open access, an email note is appreciated
Contact: <grayaw@egr.unlv.edu>
Note: select one of tick.cs.unlv.edu or tock.cs.unlv.edu at random to equalize load
US NY clock.linuxshell.net (64.243.118.2)
Location: LinuxShell Hosting, New York, NY, US.
Synchronization: NTP V3 secondary (stratum 2), PC/Linux
Service Area: Eastern US
Access Policy: Open access.
Contact: Chris Crowther (timekeeper@linuxshell.net)
Note: clock.linuxshell.net is a CNAME, please use as DNS may change.
US NY clock.nyc.he.net (209.51.161.238)
Location: Hurricane Electric, New York City, New York
Synchronization: NTP V4 primary (CMDA), Endrun Praecis CNTP
Service Area: all areas
Access Policy: open access
Contact: support@he.net
US NY ntp0.cornell.edu
Location: Cornell University, Ithaca, NY
Synchronization: NTP secondary (stratum 2), Sun/Unix
Service Area: NYSERNet, NYSERNet 2000, Internet2/Abilene, vBNS
Access Policy: open access
Contact: Dan Eckstrom (de10@cornell.edu)
Note: IP addresses are subject to change; please use DNS.
Note: Open access for clients, though an email is appreciated (especially if peering).
US NY reva.sixgirls.org (66.250.131.180)
Location: The NYITC Building, 55 Broad Street, New York City, NY
Geographic Coordinates: 40:42:20N, 74:0:40W
Synchronization: NTP V4 secondary (stratum 2), m68k/NetBSD
Service Area: New York, New Jersey, Connecticut, Long Island areas
Access Policy: open access
Contact: John Klos (john@sixgirls.org)
US NY sundial.columbia.edu (128.59.59.177)
Location: Morningside Campus, Columbia University, New York, NY
Synchronization: NTP V3 secondary (stratum 2), Sun Sparc10 model 40
Service Area: NYSERnet
Access Policy: open access; please use name rather than address.
Contact: timekeeper@columbia.edu
US NY timex.cs.columbia.edu (128.59.16.20)
Location: Columbia University Computer Science Department, New York City, NY
Synchronization: NTP secondary (stratum 2), Sun/Unix
Service Area: PSINET; NSFNET, NYSER region
Access Policy: open access, authenticated NTP (DES/MD5) available
Contact: James Tanis (timekeeper@cs.columbia.edu)
Note: IP addresses are subject to change; please use DNS
US PA clock-1.cs.cmu.edu (128.2.250.95)
Location: Carnegie Mellon University Computer Science, Pittsburgh, PA
Synchronization: NTP V3 secondary (stratum 2), Sun Sparc/Solaris 2.5.1
Service Area: PSC region
Access Policy: semi-open access; for use only by prior arrangement
Contact: Help@cs.cmu.edu
Note: The host name is an alias used only for time service.
US PA clock-2.cs.cmu.edu (128.2.222.8)
Location: Carnegie Mellon University Computer Science, Pittsburgh, PA
Synchronization: NTP V3 secondary (stratum 2), Sun Sparc/SunOS 4.1.4
Service Area: PSC region
Access Policy: semi-open access; for use only by prior arrangement
Contact: Help@cs.cmu.edu
Note: The host name is an alias used only for time service.
US PA clock.psu.edu (128.118.25.3)
Location: Penn State University, University Park, PA
Geographic Coordinates: 40:47:58.1N, 77:51:44.8W (USGS 40077-G7-TF-024)
Synchronization: NTP V3 secondary (stratum 2), Sun/Unix
Service Area: Internet2, vBNS, CERFnet(AT & T IP Services), PSC/NCNE, CASC.
Access Policy: open access
Contact: John Balogh <JDB@psu.edu>
Note: clock.psu.edu is a CNAME for otc2.psu.edu
US PA fuzz.psc.edu (128.182.58.100)
Location: Pittsburgh Supercomputing Center, Pittsburgh, PA
Synchronization: NTP V3 secondary (stratum 2), DEC5000/200
Service area: NSFNET, PSC region
Access policy: open access, but please send a message to notify.
Contact: noc@psc.edu
US PA ntp-1.cede.psu.edu (146.186.218.60)
Location: Penn State University, University Park, PA
Synchronization: NTP V4 secondary (stratum 2), IBM RS/6000-B50, Debian GNU Linux
Service Area: Internet2, vBNS, CERFnet, PSC/NCNE
Access Policy: open access, please send a message to notify
Contact: timekeeper@cede.psu.edu
Note: IP addresses are subject to change; please use DNS
US PA ntp-2.cede.psu.edu (146.186.218.253)
Location: Penn State University, University Park, PA
Synchronization: NTP V4 secondary (stratum 2), i686, Debian GNU Linux
Service Area: Internet2, vBNS, CERFnet, PSC/NCNE
Access Policy: open access, please send a message to notify
Contact: timekeeper@cede.psu.edu
Note: IP addresses are subject to change; please use DNS
US PA ntp-1.ece.cmu.edu (no address, please use DNS)
Location: Carnegie Mellon Electrical and Computer Engineering, Pittsburgh, PA
Geographic Coordinates: 40:26N, 79:57W
Synchronization: NTP V3 secondary (stratum 2), Solaris 9
Service Area: PREPNET, PSC region
Access Policy: open access
Contact: ECE Facilities (gripe@ece.cmu.edu)
Note: Name is an alias for use by NTP.
US PA ntp-2.ece.cmu.edu (no address, please use DNS)
Location: Carnegie Mellon Electrical and Computer Engineering, Pittsburgh, PA
Geographic Coordinates: 40:26N, 79:57W
Synchronization: NTP V3 secondary (stratum 2), Solaris 9
Service Area: PREPNET, PSC region
Access Policy: open access
Contact: ECE Facilities (gripe@ece.cmu.edu)
Note: Name is an alias for use by NTP.
US TX ntp.cox.smu.edu (129.119.80.126)
Location: Cox School of Business, Southern Methodist University, Dallas, TX
Synchronization: NTP V3 secondary (stratum 2), DEC 3000/300LX AXP DEC OSF/1 AXP
Service Area: NSFNET, SESQUI region
Access Policy: open access
Contact: Allen Gwinn (allen@mail.cox.smu.edu)
Note: Please send e-mail letting us know you will be using ntp.cox.smu.edu. ntp.cox.smu.edu is a CNAME for nyse.cox.smu.edu.
US TX ntp.fnbhs.com (209.144.20.76)
Location: First National Bank of Hughes Springs, TX
Synchronization: NTP secondary (stratum 2), Debian Linux 2.1
Service area: Northeast Texas
Access policy: open access, please send a message to notify
Contact: walterp@fnbhs.com
US TX ntp.tmc.edu (128.249.1.10)
Location: US TX ntp.tmc.edu (128.249.1.10)
Location: Baylor College of Medicine, Houston, TX
Synchronization: NTP secondary (stratum 2), Sun/Solaris
Service Area: NSFNET, SESQUI region
Access Policy: open access to other stratum 2 servers and upstream for statum 3 servers;not to be used for individual servers;please notify before use
Contact: Postmaster (postmaster@tmc.edu)
US TX ntppub.tamu.edu (no address available)
Location: Texas A&M University, College Station, TX
Synchronization: NTP secondary (stratum 2, ver. 3), SPARCstation 10/Solaris 1.x
Service area: NSFNET, SESQUI region, THEnet, TAMUSDSN
Access policy: open access
Contact: NTP Administrator (ntp@tamu.edu)
US TX tick.greyware.com (207.55.146.19)
Location: Greyware Automation Products, Plano, TX
Synchronization: NTP secondary (stratum 2), Windows NT
Service Area: South-Central US, others by arrangement
Access Policy: open access for any server with 50+ clients
Contact: techsupport@greyware.com
Note: IP may change, please use DNS name. Other protocols offered include TIME-UDP, TIME-TCP, and Domain Time II
US TX tock.greyware.com (207.55.146.54)
Location: Greyware Automation Products, Plano, TX
Synchronization: NTP secondary (stratum 2), Windows NT
Service Area: South-Central US, others by arrangement
Access Policy: open access for any server with 50+ clients
Contact: techsupport@greyware.com
Note: IP may change, please use DNS name. Other protocols offered include TIME-UDP, TIME-TCP, and Domain Time II
US VA ntp-1.vt.edu (198.82.1.201)
Location: Virginia Tech, Blacksburg, Virginia, USA
Synchronization: V3 Stratum 2 synced to local GPS primary servers
Service Area: US southeastern region, Abilene
Access Policy: open access
Info: Communications Network Services
Contact: ntp@cns.vt.edu
US VA ntp-2.vt.edu (198.82.1.202)
Location: Virginia Tech, Blacksburg, Virginia, USA
Synchronization: V3 Stratum 2 synced to local GPS primary servers
Service Area: US southeastern region, Abilene
Access Policy: open access
Info: Communications Network Services
Contact: ntp@cns.vt.edu
US VA ntp-3.vt.edu (198.82.1.203)
Location: Virginia Tech, Blacksburg, Virginia, USA
Synchronization: V3 Stratum 2 synced to local GPS primary servers
Service Area: US southeastern region, Abilene
Access Policy: open access
Info: Communications Network Services
Contact: ntp@cns.vt.edu
US VA ntp-4.vt.edu (198.82.1.204)
Location: Virginia Tech, Blacksburg, Virginia, USA
Synchronization: V3 Stratum 2 synced to local GPS primary servers
Service Area: US southeastern region, Abilene
Access Policy: open access
Info: Communications Network Services
Contact: ntp@cns.vt.edu
US VT ntp0.state.vt.us (159.105.23.194)
Location: Vermont Agency of Administration, Montpelier
Synchronization: NTP V3 secondary (stratum 2), IBM RS/6000 AIX 4.3.3
Service Area: Vermont
Access Policy: semi-open access; for use by any Govnet/K12net/VALS clients (159.105/16 & 170.222/16 prefixes)
Contact: <info@govnet.state.vt.us>
Note: The host name is an alias used only for time service.
US VT ntp1.state.vt.us (159.105.23.130)
Location: Vermont Agency of Administration, Montpelier
Synchronization: NTP V3 secondary (stratum 2), IBM RS/6000 AIX 4.3.3
Service Area: Vermont
Access Policy: semi-open access; for use by any Govnet/K12net/VALS clients (159.105/16 & 170.222/16 prefixes)
Contact: <info@govnet.state.vt.us>
Note: The host name is an alias used only for time service.
US VT ntp2.state.vt.us (170.222.64.130)
Location: Vermont Agency of Administration, Montpelier
Synchronization: NTP V3 secondary (stratum 2), IBM RS/6000 AIX 4.3.3
Service Area: Vermont
Access Policy: semi-open access; for use by any Govnet/K12net/VALS clients (159.105/16 & 170.222/16 prefixes)
Contact: <info@govnet.state.vt.us>
Note: The host name is an alias used only for time service.
US WA [UltiMeth Systems]
Location: Mill Creek (30km N of Seattle), Washington, USA
Geographic Coordinates: 47:51:40.7N 122:11:23.5W
Synchronization: NTP v4 stratum-2
Service Area: Northwestern USA.
Access Policy: Prior permission is now required, due to bozos.
Contact: See our time server usage notes.
US WI ntp1.cs.wisc.edu (128.105.39.11)
Location: Computer Science Department, University of Wisconsin-Madison
Geographic Coordinates: 89:24:30W, 43:08:00N
Synchronization: NTP V4 secondary Solaris 2.7
Service Area: US/any
Access Policy: open access
Contact: David Thompson ( ntp-admin@cs.wisc.edu)
US WI ntp3.cs.wisc.edu (128.105.37.11)
Location: Computer Science Department, University of Wisconsin-Madison
Geographic Coordinates: 89:24:30W, 43:08:00N
Synchronization: NTP V4 secondary Solaris 2.7
Service Area: US/any
Access Policy: open access
Contact: David Thompson ( ntp-admin@cs.wisc.edu)
Note: IP addresses are subject to change; please use DNS
US WI ntp3.sf-bay.org (207.126.97.57)
Location: Milwaukee, WI
Synchronization: NTP secondary (stratum 2), FreeBSD
Service Area: North America: Central Time Zone
Access Policy: open access, please send a message to notify
Contact: Scott Hazen Mueller (clockmaster@sf-bay.org)
VE ntp.linux.org.ve (150.188.8.196)
Localizaci: VELUG, Grupo de Usuarios Linux de Venezuela
Sincronizaci: NTP secundario (stratum 2), Pentium/Linux
Area de Servicio: Arica
Potica de Acceso: Abierta, por favor enviar e-mail para notificar
Contacto: time@linux.org.ve
ZA ntp.cs.unp.ac.za (143.128.82.200)
Location: Natal University, Pietermaritzburg, South Africa
Synchronization: NTP V3 secondary (stratum 2), SGI Indy/Irix6.2
Service area: South Africa
Access policy: open access, please send a message to notify
Contact: sysadmin@cs.unp.ac.za
ZA tock.nml.csir.co.za (146.64.241.229)
Location: Pretoria, South Africa
Geographic Coordinates: 25,7461 S 28,2770 E (WGS-84)
Service Area: Southern Africa
Synchronization: NTP secondary (stratum 2), i386/FreeBSD
Access Policy: open access
Contact: elmarais@csir.co.za

Discontinued Service

allison.radiks.net
bernina.ethz.ch
black-ice.cc.vt.edu
calvus.rzs-hm.si
chime.utoronto.ca
chime1.surfnet.nl
chrivh40.cch.com (198.147.37.140)
churchy.udel.edu
clock.netcetera.dk
clock2.netcetera.dk
clock.tricity.wsu.edu
constellation.ecn.uoknor.edu
delphi.cs.ucla.edu
dominator.eecs.harvard.edu
eagle.tamu.edu
finch.cc.ukans.edu
fuzz.sura.net
gazette.bcm.tmc.edu
hmljhp.rzs-hm.si
kuhub.cc.ukans.edu
lassen.slc.ca.gov
libra.rice.edu
ntp.adelaide.edu.au
ntp.botbay.net
ntp.ctr.columbia.edu
ntp.landau.ac.ru
ntp.olivetti.com
ntp.pop-df.rnp.br
ntp.terabyte.com.uabr
ntp.to.themasses.org
ntp.waikato.ac.nz
ntp1.mpis.net
ntp2.mpis.net
ntp1.ossi.com
ntp1.sura.net
ntp2.ossi.com
ntp2.sura.net
salmon.maths.tcd.ie
smart1.svi.org
tick.anice.net.ar
tick.koalas.com
ticktock.wang.com
ntp.cmr.gov
time.deakin.edu.au
time.esec.com.au
time.nuri.net
time.software.net
tmc.edu
tock.anice.net.ar
truechimer.waikato.ac.nz
vtserf.cc.vt.edu
wuarchive.wustl.edu
www1.cmc.ec.gc.ca
www2.cmc.ec.gc.ca
xfiles-jr.esa.lanl.gov
xfiles.esa.lanl.gov

Public NTP Secondary (stratum 2) Time Servers

Related Links

Active Servers

Discontinued Service