| NTP Active Servers 
Active Servers
- AU ntp0.coreng.com.au (203.60.1.2)
Location: Corinthian Engineering P/L, Sydney Australia.
Geographic Coordinates: 33:50S 151:09E
Synchronization: NTP V4 primary (Trimble Acutime GPS+PPS), i386/FreeBSD 4.8-STABLE.
Service area: Australia.
Access policy: open access to Australian organisations, please limit to two peer hosts per site.
Note: Use DNS ntp0.coreng.com.au as IP address is likely to change.
Contact: Richard Perini (ntp@coreng.com.au)
- AU ntp0.cs.mu.OZ.AU (128.250.36.2)
Location: The University of Melbourne, Melbourne, Australia
Geographic Coordinates: 37:48:09.60S 144:57:29.50E
Synchronization: NTP V4 primary (Trimble Acutime GPS), i386/NetBSD 1.6
Service area: Australia, New Zealand, Pacific Region
Access policy: open access, please limit to two peer hosts per site
Note: service previously available at 128.250.37.1 moved to 128.250.37.2
Contact: David Hornsby (ntp@cs.mu.OZ.AU)
- AU ntp1.cs.mu.OZ.AU (128.250.36.3)
Location: The University of Melbourne, Melbourne, Australia
Geographic Coordinates: 37:48:09.60S 144:57:29.50E
Synchronization: NTP V4 primary (Magellan OEM GPS), i386/NetBSD 1.6
Service area: Australia, New Zealand, Pacific Region
Access policy: open access, please limit to two peer hosts per site
Contact: David Hornsby (ntp@cs.mu.OZ.AU)
- BR ntp1.rnp.br (200.19.119.69)
Location: Brazilian Research Network/Rede Nacional de Pesquisa (RNP)
Geographic Coordinates: 15=B0 48.275963' S, 47=B0 52.904663' N, 1101.146m (WGS-84)
Synchronization: NTP V4 Primary (Trimble Palisade GPS), FreeBSD/Unix
Service Area: Brazil
Access Policy: Open access to stratum 1, stratum 2 within Brazilian
Research Network (RNP). Others by prior arrangement only.
Contact: ntp-admin@rnp.br
- BR ntps1.pads.ufrj.br (146.164.48.5 / 3ffe:2b00:100:10d:100::5) (CNAME ntp-s1.pads.ufrj.br)
Location: Laboratory for the Processing of Analog and Digital Signals (PADS), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
Geographic Coordinates: Lat: 22°51.7031'S. Lon: 043°13.7045'W. Alt: 25m.
Synchronization: NTP V4 Primary (Garmin Etrex GPS with RA-46 system and
1 PPS external stabilized oscillator), PC/Linux with nanokernel.
Service Area: Brazil, Latin America and Caribbean.
Access Policy: Open access, please limit to two peer hosts
(preferentially stratum 2 servers) per domain. Clients (end-users)
should use only stratum 2 servers for synchronization.
Contact: Rafael Jorge Csura Szendrodi (szendro@pads.ufrj.br).
Note: IP addresses (IPv4 and IPv6) are subject to change, please use DNS instead!
- CA clock.uregina.ca (142.3.100.2)
Location: University of Regina, Regina, Saskatchewan, Canada
Geographic Coordinates: 50:25N , 104:35W
Synchronization: NTP V4 Primary (GPS clock), PC/FreeBSD
Service Area: SASK#net, CA*net, Canada
Access Policy: open to stratum2 time servers, others by arrangement.
Contact: Mark Haidl (timekeeper@uregina.ca)
Note: for reliable access please notify with IP of your server
- CA subitaneous.cpsc.ucalgary.ca (136.159.2.254)
Organization: Department of Computer Science, University of Calgary
Location: Calgary, Alberta, Canada
Geographic Coordinates: Latitude: 51.0801 Longitude: -114.1281
Synchronization: NTP V4 Primary (GPS clock), UltraSparc/Solaris
Service Area: North America
Access Policy: Open to stratum 2 time servers, others by arrangement. Please notify us.
Contact: Shaun Laing (timemaster@cpsc.ucalgary.ca)
Note: The IP address is subject to change so please use DNS.
- CA tick.usask.ca (128.233.3.100)
Location: University oc Saskatchewan, Saskatoon, Saskatchewan, SK, Canada
Geographic Coordinates: 52:08:01N,106:38:11W
Synchronization: NTP V3 Primary (GOES clock), DEC Mips/Unix
Service Area: SASK#net, CA*net, Canada
Access Policy: open access, prior arrangment required
Contact: Alfred Hovdestad (alfred.hovdestad@usask.ca)
Note: priority given to local regional sites
Note: tick.usask.ca and tock.usask.ca share a single GOES receiver
- CA tock.usask.ca (128.233.3.101)
Location: University oc Saskatchewan, Saskatoon, Saskatchewan, SK, Canada
Geographic Coordinates: 52:08:01N,106:38:11W
Synchronization: NTP V3 Primary (GOES clock), DEC Mips/Unix
Service Area: SASK#net, CA*net, Canada
Access Policy: open access, prior arrangment required
Contact: Alfred Hovdestad (alfred.hovdestad@usask.ca)
Note: priority given to local regional sites
Note: tick.usask.ca and tock.usask.ca share a single GOES receiver
- CH ntp.metas.ch (193.5.216.14)
Location: Federal Office of Metrology and Accreditation Switzerland (METAS), Bern, Switzerland
Geographic Coordinates: N 46:55:25 E 07:27:51
Synchronization: radiosynchronized receiver locked to HBG transmitter and ACTS dial-up link to METAS T&lab UTC(CH)
Service Area: Switzerland, others by arrangement
Access Policy: open access, please send a message to notify
Note: the IP address may change, please use DNS
Contact: Laurent-Guy Bernier (laurent-guy.bernier@metas.ch)
- CH swisstime.ethz.ch (129.132.2.21)
Location: Integrated Systems Laboratory, Swiss Fed. Inst. of Technology, CH 8092 Zurich, Switzerland
Geographic Coordinates: 47:23N, 8:32E
Synchronization: NTP primary (DCF77 clock), Sun-4/SunOS 4.1.4
Service Area: Switzerland/Europe
Access Policy: open access
Contact: Christoph Wicki (time@iis.ee.ethz.ch)
- CL ntp.dgf.uchile.cl (146.83.8.200)
Location: Dpto. GeofÃsica, Universidad de Chile. Santiago, Chile.
Geographic Coordinates: Lat: 33° 27.19'S. Lon: 70° 39.70'W. Alt: 533m.
Synchronization: NTP V3 primary (GOES OM/DC-468 clock), SunSparc10/SunOS 4.1.3.
Service area: REUNA and interconnected networks, Chile.
Access Policy: open access, please send a message to notify.
Contact: Gonzalo Pérez (gperez@dgf.uchile.cl)
Note: ntp is an alias and the IP address may change; please use DNS.
- CL ntp.shoa.cl (200.54.149.19)
location: Servicio Hidrografico y Oceanografico de la Armada de Chile
Geographic coordinates: 33:01,6958S 71:38,1136W (WGS-84)
Synchronization: NTP V4 primary (GPS Clock), i386 Redhat Linux
Service Area: Chile
Access Policy: open access
contact: Raul Vergara (rvergara@shoa.cl)
- CZ ntp.cesnet.cz (195.113.144.201)
Location: CESNETPrague, The Czech Republic
Geographic Coordinates: 50° 6.11' N, 14° 23.49' E, +252 m
Synchronization: NTP V4 primary (Garmin GPS35), PC / Linux with nanokernel
Service Area: Czech Republic and Slovakia, European academic community
Access Policy: open to servers providing synchronization to ten or more hosts, others by arrangement
Contact: Vladimir Smotlacha (ntp-admin@cesnet.cz)
Note: ntp is an alias and the IP address may change; please use DNS.
- DE ntp0.fau.de (131.188.3.220)
Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG
Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)
Synchronization: NTP V3 primary (GPS receiver (<<1us)), Sun SS10/Unix SunOS 5.6
Service Area: Germany/Europe
Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de
Contact: The Timekeepers (time@informatik.uni-erlangen.de) Note: IP addresses are subject to change; please use DNS
- DE ntp1.fau.de (131.188.3.221)
Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG
Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)
Synchronization: NTP V3 primary (DCF77 PZF receiver (<50us)), Sun SS10 SunOS 5.6
Service Area: Germany/Europe
Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de
Contact: The Timekeepers (time@informatik.uni-erlangen.de)
Note: IP addresses are subject to change; please use DNS
- DE ntp2.fau.de (131.188.3.222)
Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG
Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)
Synchronization: NTP V3 primary (GPS receiver (<<1us)), Sun SS10/SunOS 5.6
Service Area: Germany/Europe
Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de
Contact: The Timekeepers (time@informatik.uni-erlangen.de)
Note: IP addresses are subject to change; please use DNS
- DE ntp3.fau.de (131.188.3.223)
Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG
Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)
Synchronization: NTP V3 primary (DCF77 PZF receiver (<50us)), Sun SS10/SunOS 5.6
Service Area: Germany/Europe
Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de
Contact: The Timekeepers (time@informatik.uni-erlangen.de)
Note: IP addresses are subject to change; please use DNS
- DE ntps1-0.cs.tu-berlin.de (130.149.17.21)
Location: Technische Universitaet Berlin, D-10587 Berlin, FRG
Geographic Coordinates: 52.518N 13.326E
Synchronization: NTP V3 primary (Meinberg GPS 166), Sun 4/65 SunOS4.1.3
Service Area: Germany/Europe
Access Policy: open access
Contact: Gerard Gschwind (gg@cs.tu-berlin.de)
- DE ntps1-1.cs.tu-berlin.de (130.149.17.8)
Location: Technische Universitaet Berlin, D-10587 Berlin, FRG
Geographic Coordinates: 52.518N 13.326E
Synchronization: NTP V3 primary (Meinberg GPS 166), SunS10-402 SunOS5.4
Service Area: Germany/Europe
Access Policy: open access
Contact: Gerard Gschwind (gg@cs.tu-berlin.de)
- DE ptbtime1.ptb.de (192.53.103.103)
Location: Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
Synchronization: NTP V3 primary (Primary standards CS1, CS2), HP9000/744/HP-UX
Service Area: Germany/Europe, others by arrangement
Access Policy: open access, please send a message to notify.
Contact: Dieter Sibold, Ronald Scheffler (ntp-admin@ptb.de)0
Note: ptbtime1.ptb.de is an alias and the IP address may change; please use DNS.
- DE ptbtime2.ptb.de (192.53.103.104)
Location: Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
Synchronization: NTP V3 primary (PTB's primary standards CS1, CS2), HP9000/744/HP-UX
Service Area: Germany/Europe, others by arrangement
Access Policy: open access, please send a message to notify.
Contact: Dieter Sibold, Ronald Scheffler (ntp-admin@ptb.de)
Note: ptbtime2.ptb.de is an alias and the IP address may change; please use DNS.
- DE rustime01.rus.uni-stuttgart.de (129.69.1.153)
Location: Computer Center University of Stuttgart, D-70550 Stuttgart, Germany
Geographic Coordinates: 48:47N, 9:10E
Synchronization: NTP V3 primary (Meinberg DCF-77 PZF 535/TCXO), IBM RS6000-250, AIX 4.x
Service Area: Germany/Europe
Access Policy: open, preferred for stratum-2 servers providing
synchronization to local networks; appreciate email notification
Contact: Walter Wehinger (wehinger@rus.uni-stuttgart.de)
- DK Denmark GPS.FreeBSD.dk (212.242.86.186)
Location: Slagelse, Denmark
Geographic Coordinates: 55:24:22.03N, 11:20:22.98E
Synchronization: NTP V4 GPS with rubidium timebase
Service Area: As network paths make it sensible
Access Policy: open access to servers, please, no client use
Contacts: Poul-Henning Kamp (phk@FreeBSD.org)
Note: timestamps better than +/-50 nsec
- DK Denmark GPS.dix.dk (192.38.7.240)
Location: Lyngby, Denmark
Geographic Coordinates: 55:47:03.36N, 12:03:21.48E
Synchronization: NTP V4 GPS with OCXO timebase
Service Area: Networks BGP-announced on the DIX
Access Policy: open access to servers, please, no client use
Contacts: Poul-Henning Kamp (phk@FreeBSD.org)
Note: timestamps better than +/-5 usec.
- FR canon.inria.fr (192.93.2.20)
Location: INRIA, Rocquencourt (near Paris), France
Synchronization: NTP V3 primary (GPS), Datum TymServe 2100L
Service Area: France/Europe
Access Policy: open access, please send a message to notify
Contact: ntp-adm@inria.fr
Note: We use a Datel RCH208 clock with SER024 V24 interface.
- FR chronos.cru.fr
Location: University of Rennes 1, Britany, France
Synchronization: NTP V3, Datum TymServe 2100L with GPS
Service Area: France/Europe
Access Policy: open access to stratum-2 servers, send a message to notify
Contact: timemaster@cru.fr
Note: use DNS for IP address
- FR ntp-p1.obspm.fr
Location: BNM-SYRTE, Observatoire de Paris, Paris, France
Synchronization: NTP V3, Datum TymServe 2100 with 1PPS
Service Area: France/Europe
Access Policy: open access to stratum-2 servers, but please send a message to notify
Contact: info.bnm-syrte@obspm.fr, More Informations?
Note: Ref: 1PPS from Atomic Clock
- FR ntp-sop.inria.fr (138.96.64.10)
Location: INRIA, Sophia Antipolis (French Riviera, near Nice), France
Synchronization: NTP V3 primary (GPS), PC/Linux
Service Area: RENATER, R3T2, France/Europe
Access Policy: open to servers providing synchronization to reasonnable size networks (>10 hosts).
Contact: ntp-adm@sophia.inria.fr, More help?
Note: We use a MC2 Starsync GPS EISA card
- FR ntp1.curie.fr
Location: Institut Curie, Section de Recherche, Paris, France.
Synchronization: Coetanian TSS100 NTP V3 GPS
Service area: all areas.
Access policy: Universities, academic research centers, non-profit org ONLY.
Contact: ntp-adm@curie.fr
Note: use DNS for IP address
- FR ntp2.curie.fr
Location: Institut Curie, Section de Recherche, Paris, France.
Synchronization: Datum 2100L NTP V3 GPS
Service area: all areas.
Access policy: Universities, academic research centers, non-profit org ONLY.
Contact: ntp-adm@curie.fr
Note: use DNS for IP address
- FR ntp3.curie.fr
Location: Institut Curie, Section de Recherche, Paris, France.
Synchronization: Truetime NTS100 GPS
Service area: France/Europe.
Access policy: Universities, academic research centers, non-profit org ONLY.
Contact: ntp-adm@curie.fr
Note: use DNS for IP address
- HK clock.cuhk.edu.hk
Location: The Chinese University of Hong Kong.
Geographic Coordinates: 22:25:10N,114:12:22E
Synchronization: NTP V3 Primary (TSS-100 GPS clock)
Service Area: Hong Kong, China and South East Asia
Access Policy: open access
Contact: Connie Law (connieL@cuhk.edu.hk), KM Fung
(kinming@cuhk.edu.hk) Note: IP addresses are subject to change; please
use DNS - IE ntp-galway.hea.net
Location: Dept. of Information Technology, National University of Ireland, Galway, Ireland
Synchronization: NTPV4 primary (Trimble Acutime GPS), Intel, Linux 6.2
Service Area: Ireland, UK
Access Policy: open access, please send a message to notify
Contact: ntp@it.nuigalway.ie
Note: IP address is subject to change so please use DNS.
- IT ntp1.ien.it (193.204.114.232)
Location: IEN Galileo Ferraris, Torino, Italy
Synchronization: NTP primary (Cesium Beam Frequency Standard), PC/Linux
Service Area: Italy/Europe
Access Policy: open access, pick one of ntp{1,2}.ien.it; please send a message to notify
Contact: ntp.info@ien.it
Note: IP addresses are subject to change; please use DNS
- IT ntp2.ien.it (193.204.114.233)
Location: IEN Galileo Ferraris, Torino, Italy
Synchronization: NTP primary (Cesium Beam Frequency Standard), PC/Linux
Service Area: Italy/Europe
Access Policy: open access, pick one of ntp{1,2}.ien.it; please send a message to notify
Contact: ntp.info@ien.it
Note: IP addresses are subject to change; please use DNS
- IT tempo.cstv.to.cnr.it (150.145.33.1)
Location: CSTV of National Research Council, Torino, Italy
Geographic Coordinates: 45:00:54N, 7:38:20.7E, 306.6H
Syncronization: NTP V3 primary (IEN CTD clock), DecSystem 5500/Ultrix 4.4
Service Area: Italy/Europe
Access Policy: open access
Contact: Fabrizio Pollastri (pollastri@cstv.to.cnr.it)
Note: information at http://www.cstv.to.cnr.it/toi
- JP clock.nc.fukuoka-u.ac.jp (133.100.9.2)
Location: Fukuoka university, Fukuoka, Japan
Geographic Coodinates: 130:21.81E, 33:32.87N
Synchronization: NTP V3.3 primary (GPS clock), Heliostation 400/SunOS 4.1.3
Service Area: Japan/Pacific area
Access Policy: open access
Contact: TSURUOKA Tomoaki (tsuruoka@fukuoka-u.ac.jp), YOSHIMURA Kenji (yosimura@tl.fukuoka-u.ac.jp)
Note: We use a TRAK 8810 GPS STATION CLOCK and a Furuno Electric Co.'s GN-72 GPS receiver respectively.
- JP clock.tl.fukuoka-u.ac.jp (133.100.11.8)
Location: Fukuoka university, Fukuoka, Japan
Geographic Coodinates: 130:21.81E, 33:32.87N
Synchronization: NTP V3.3 primary (GPS clock), Heliostation 400/SunOS 4.1.3
Service Area: Japan/Pacific area
Access Policy: open access
Contact: TSURUOKA Tomoaki (tsuruoka@fukuoka-u.ac.jp), YOSHIMURA Kenji (yosimura@tl.fukuoka-u.ac.jp)
Note: We use a TRAK 8810 GPS STATION CLOCK and a Furuno Electric Co.'s GN-72 GPS receiver respectively.
- MX cronos.cenam.mx
Location: Centro Nacional de Metrologia, Queretaro, Mexico
Geographic coordinates: 20:32:9.6 N, 100:16:18 W, +1912
Synchronization: Interlock algorithm with direct 1 pps from rimary
frequency standard of CENAM, UTC(CENAM)
Service Area: All Mexico and USA
Access policy: Open access
Contact: J. Mauricio Lopez R., jlopez@cenam.mx , 52 4 211 0543
- NL ntp0.nl.net (193.67.79.202)
Location: NLnet, Amsterdam, The Netherlands
Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3
Service Area: The Netherlands/Europe
Access Policy: open access
Contact: beheer@nl.net
- NL ntp1.nl.net (193.79.237.14)
Location: NLnet, Amsterdam, The Netherlands
Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3
Service Area: The Netherlands/Europe
Access Policy: open access
Contact: beheer@nl.net
- NL ntp2.nl.net (193.79.237.30)
Location: NLnet, Amsterdam, The Netherlands
Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3
Service Area: The Netherlands/Europe
Access Policy: open access
Contact: beheer@nl.net
- NO time.service.uit.no
Location: The EDB Centre, University of Tromsoe, Norway
Synchronization: NTP V3 primary (GPS clock), HP-UX/Unix
Service Area: NORDUnet
Access Policy: semi-open access, prior arrangment required
Contact: (timekeeper@uit.no)
- NZ clock1.canterbury.ac.nz (132.181.10.44)
Location: Computer Science
Department, University of Canterbury
Synchronization: NTP V4 primary (Trimble Palisade GPS), RedHat Linux
Service Area: New Zealand
ccess Policy: restricted to stratum-2 servers providing synchronization to
local networks of ten or more hosts, by prior arrangement
Contact: Pete Glassenbury (pete@cosc.canterbury.ac.nz)
Note: IP addresses are subject to change; please use DNS
- PL ntp.certum.pl (217.153.69.35)
Location: Unizeto Sp. z o.o., ul. Krolowej Korony Polskiej 21, 70-486 Szczecin
Geographic Coordinates: 53:26:15N 14:31:58E
Synchronization: NTP V4 primary (Meinberg GPS 167/PPS), Linux
Service Area: Poland/Europe
Access Policy: open access
Contact: Wojtek Slusarczyk (wslusarczyk@certum.pl)
- PL vega.cbk.poznan.pl (150.254.183.15)
Location: Astrogeodynamical Observatory, Space Research Centre, Borowiec, Poland
Synchronization: NTP V3 primary (Caesium clock), PC Pentium, RedHat Linux
Service Area: Poland/Europe
Access Policy: open access
Contact: Robert Diak (kondor@cbk.poznan.pl), Jerzy Nawrocki (nawrocki@cbk.poznan.pl)
- SE ntp1.gbg.netnod.se (192.36.133.130)
Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Gothenburg, Sweden)
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV),FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Magnus Andersson; See also NTP time server statistics
- SE ntp2.gbg.netnod.se (192.36.133.66)
Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Gothenburg, Sweden)
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Magnus Andersson; See also NTP time server statistics
- SE ntp1.mmo.netnod.se (192.36.134.17)
Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Malmoe, Sweden)
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Magnus Andersson; See also NTP time server statistics
- SE ntp2.mmo.netnod.se (192.36.134.25)
Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Malmoe, Sweden)
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Magnus Andersson; See also NTP time server statistics
- SE ntp1.sp.se (62.119.40.98)
Location: SP Swedish National Testing and Research Institute, BORAS, SWEDEN
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale), FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Kenneth Jaldehag info@sp.se; See also NTP time server statistics
- SE ntp2.sp.se (62.119.40.99)
Location: SP Swedish National Testing and Research Institute, BORAS, SWEDEN
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale), FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Kenneth Jaldehag info@sp.se; See also NTP time server statistics
- SE ntp1.sth.netnod.se (192.36.144.22)
Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Stockholm, Sweden)
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Magnus Andersson; See also NTP time server statistics
- SE ntp2.sth.netnod.se (192.36.144.23)
Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Stockholm, Sweden)
Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD
Service Area: all areas
Access Policy: open access
Contact: Magnus Andersson; See also NTP time server statistics
- SE time1.stupi.se (192.36.143.150)
Location: Stupi AB, Stockholm, SWEDEN
Synchronization: NTP V3 primary (Saphir Cesium Beam Standard/GPS), BSDI Unix
Service Area: SUnet, NORDUnet
Access Policy: open access
Contact: Peter Lothberg (roll@Stupi.SE)
- SE time2.stupi.se (192.36.143.151)
Location: Stupi AB, Stockholm, SWEDEN
Synchronization: NTP V4 primary (HP5071, FreeBSD)
Service Area: Europe
Access Policy: open access
Contact: roll@stupi.se (Peter Lothberg)
- SG jamtepat.singnet.com.sg (165.21.110.7)
Location: SingNet, Singapore
Geographic Coordinates: 1.292N 103.808E (GPS WGS84)
Synchronization: Datum Tymserve 2100-GPS
Service Area: STIX/Asia (outside Singapore), others by arrangement
Access Policy: port access granted by arrangement
Contact: timekeeper@singnet.com.sg
- SG nets.org.sg (203.117.180.36)
Location: SPRING Singapore
Synchronization: ACTS dial-up using lockclock algorithm; Compaq Alpha UNIX
Service Area: Singapore and Asia
Access Policy: Open to stratum-2 servers and others by arrangement
Contact: Liu YanYing (lyy@spring.gov.sg) 65-67739852
- SI goodtime.ijs.si (193.2.4.2)
Location: J. Stefan Institute, Ljubljana, Slovenia
Geographic Coordinates: 46° 2.517' N, 14° 29.241' E, +363 m (WGS84)
Synchronization: NTP V4 primary (Trimble Palisade GPS), Compaq (DEC) Alpha / Tru64 Unix with MICRO_TIME kernel option
Service Area: Slovenia, European academic community, others by arrangement
Access Policy: restricted to servers providing synchronization to ten
or more hosts, please send notification before regular use
Contact: MarkMartinec (timekeeper@ijs.si); More info?
Note: NTP V4 clients preferred for their lower load and better accuracy; IP address subject to change
- UK chronos.csr.net 194.35.252.7 (CNAME ntp.csr.net)
Location: Computing Systems Research Ltd. United Kingdom
Geographic Coordinates: 0:49:10W 52:14:54N (480578m 261841m)
Synchronization: NTP V4 primary (Odetics GPS), Sun/Sparc Solaris 2.6
Service Area: United Kingdom Western Europe
Access Policy: open access
Contact: C Buckingham (chrisb@csr.net)
- UK ntp.my-inbox.co.uk (81.168.77.149)
Location: Falmouth, Cornwall, UK
Synchronisation: NTP V4.2.0 primary (MSF Radio Clock Receiver), Trustix Linux
Service Area: United Kingdom
Access Policy: open
Contact: Phil Curnow phil@my-inbox.co.uk
- UK ntp2.ja.net (193.63.94.26)
Location: University of London Computer Centre, UK
Synchronization: NTP V3 primary (MSF clock), Sun/Unix
Service Area: JANET
Access Policy: closed access, see notes below.
Contact: jips-nosc@nosc.ja.net
Note: This server is part of the JANET NTP service and is available for
JANET stratum-2 clients and for peering with external stratum-1 clocks.
Any external stratum-1 peering requests should be emailed to the
Contact address. - US AK ntp.alaska.edu (199.165.76.11) (CNAME ntp-ua.usno.navy.mil)
Location: University of Alaska, Fairbanks, AK (147 50 59.7W 64 51 27.3N WGS84)
Synchronization: NTP V3 primary (GPS)
Service area: Pacific Northwest, others by arrangement
Access Policy: open access for stratum 2 servers
Contact: Rich Schmidt, US Naval Observatory (res@tuttle.usno.navy.mil)
- US CA clepsydra.dec.com (204.123.2.5)
Location: HP Western Research Laboratory, Palo Alto, CA
Synchronization: NTP V4 primary (GPS)
Service Area: NSFNET, BARR region
Access Policy: open access
Contact: ntp-admin@wrl-mail.hpl.hp.com
- US CA clock.isc.org (192.5.5.250)
Location: Internet Software Consortium, Palo Alto, CA
Geographic Coordinates: 122 9 41 W / 37 26 35 N
Synchronization: NTP primary (GOES clock), BSD UNIX
Service Area: BARRnet, Alternet-west, CIX-west
Access Policy: open access
Contact: Paul Vixie (paul@vix.com)
- US CA clock.via.net (209.81.9.7)
Location: ViaNet Communications, Palo Alto, CA, USA
Synchronization: NTP V3 with Trimble Pasisade GPS receiver/FreeBSD
Service Area: All areas
Access Policy: open access
Contact: Joe McGuckin (joe@via.net)
- US CA gpstime.trimble.com 206.40.88.30
Location: Sunnyvale, CA US
Synchronization: NTP primary (GPS clock), Trimble Palisade on Windows NT 4.0
Service Area: Western US
Access Policy: open access, stratum 3 or higher requested
Contact: Sven Dietrich, sven_dietrich@trimble.com or zane_brady@trimble.com
- US CA montpelier.ilan.caltech.edu (192.12.19.20) CNAMES: montpelier.caltech.edu, ntp-caltech.usno.navy.mil
Location: California Institute of Technology, Pasadena, CA
Synchronization: NTP V3 primary (GPS clock)
Service area: USA Pacific timezone, others by arrangement
Access Policy: open access for stratum 2 servers
Contacts: Rich Schmidt, US Naval Observatory (res@tuttle.usno.navy.mil),
Heather Sherman, California Institute of Technology, (network@caltech.edu)
- US CA nist1.aol-ca.truetime.com (207.200.81.113)
Location: AOL Time Warner facility, Sunnyvale, California
Synchronizaton: Lockclock Algorithm and ACTS dial-up, GPS-stabilized oscillator for short-term stabilization
Service Area: Western US
Access Policy: Open access for up to 20 queries per hour (one-day average) from any one address, others by arrangment
Contact: Judah Levine, jlevine@boulder.nist.gov, 303 492 7785
- US CA nist1.datum.com (66.243.43.21)
Location: Datum Inc., Bancomm-Timing Division, San Jose, California
Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX
Service Area: Primarily networks in Western US
Access Policy: Open to stratum-2 servers and others by arrangement.
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492-7785
- US CA nist1-sj.glassey.com (207.126.98.204)
Location: Abovenet, San Jose, California
Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX
Service Area: Western US
Access Policy: Open to stratum-2 servers and others by arrangement
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492-7785
- US CA ntp-cup.external.hp.com (192.6.38.127)
Location: Cupertino CA (SF Bay area) 37:20N/122:00W
Synchronization: NTPv3 primary, HP-UX/Palisade-GPS
Service Area: West Coast USA
Access Policy: open access
Contact: timer@cup.hp.com
Note: no need to notify for access, go right ahead!
- US CA ntp.nasa.gov (198.123.30.132)
Location: NASA Ames Research Center, Moffett Field, CA
Synchronization: NTP V3 primary GPS Clock
Service Area: NSFNET, BARR region, NASA NSN, DOE ESNET, DDN
Access Policy: prior permission required
Contact: clockmaster@ntp.nasa.gov
- US CA tick.gpsclock.com (206.203.0.15)
Location: GPSClock.com headquarters, Redondo Beach, CA
Geographic Coordinates: 33:50:26.510N, 118:22:55.245W
Synchronization: NTP V4 primary, GPSClock 300 hard PPS, FreeBSD
Service Area: US Pacific, Los Angeles area
Access Policy: Open to stratum 2 servers for 10 or more hosts, others upon request
Contacts: Frank Mayhar (clock@gpsclock.com)
- US CA tick.ucla.edu (164.67.62.194) CNAMEs: navobs1.ucla.edu, time.ucla.edu
Location: UCLA, Los Angeles, CA
Synchronization: NTP V3 primary (GPS) HP9000/747i
Service area: Pacific time zone, others on request
Access policy: open access to stratum-2 servers and to UCLA clients
Contacts: Rich Schmidt (res@tuttle.usno.navy.mil), Scott Burris (scott@cns.ucla.edu)
- US CA timekeeper.isi.edu (128.9.176.30)
Location: USC Information Sciences Institute, Marina del Rey, CA
Geographic Coordinates: 33:58:49N, 118:26:20W (USGS map NAD27)
Synchronization: NTP V3 primary Datum Tymserve 2100-GPS
Service Area: CalRen2, Los Nettos region
Access Policy: open access
Contact: Information Processing Center (action@isi.edu)
- US CA tock.gpsclock.com (206.223.0.14)
Location: GPSClock.com headquarters, Redondo Beach, CA
Geographic Coordinates: 33:50:26.510N, 118:22:55.245W
Synchronization: NTP V4 primary, GPSClock 200 hard PPS, FreeBSD
Service Area: US Pacific, Los Angeles area
Access Policy: Open to stratum 2 servers for 10 or more hosts, others upon request
Contacts: Frank Mayhar (clock@gpsclock.com)
- US CA usno.pa-x.dec.com (204.123.2.72) CNAME: navobs1.pa-x.dec.com
Location: Systems Research Center, Compaq Computer Corp. Palo Alto, CA (122 9 41.7 W 37 26 42.6 N WGS84)
Synchronization: NTP V3 primary (GPS)
Service area: USA Pacific and Mountain timezones, others by arrangement.
Access Policy: open access
Contact: Rich Schmidt, US Naval Observatory (res@tuttle.usno.navy.mil)
Paul Flaherty, Digital Equipment Corp.(flaherty@pa.dec.com) - US CO navobs1.usnogps.navy.mil (204.34.198.40) CNAME: tick.usnogps.navy.mil
Location: Falcon AFB, Colorado
Geographic Coordinates: 104 31 30 W, 38 48 30 N WGS84
Synchronization: NTP V3 primary (USNO Alternate Master Clock H-maser) HP9000/747i
Service area: USA Pacific and Mountain timezones, others by arrangement.
Access Policy: open access
Contact: Rich Schmidt, US Naval Observatory (res@tuttle.usno.navy.mil)
- US CO navobs2.usnogps.navy.mil (204.34.198.41) CNAME: tock.usnogps.navy.mil
Location: Falcon AFB, Colorado
Geographic Coordinates: 104 31 30 W, 38 48 30 N WGS84
Synchronization: NTP V3 primary (USNO Alternate Master Clock H-maser) HP9000/747i
Service area: USA Pacific and Mountain timezones, others by arrangement.
Access Policy: open access
Contact: Rich Schmidt, US Naval Observatory (res@tuttle.usno.navy.mil)
- US
CO time-a.nist.gov (129.6.15.28) New Access policy: Open only to
existing users; other users please use time-b or time-c instead.
- US CO time-a.timefreq.bldrdoc.gov (132.163.135.130, 132.163.4.101)
Location: NIST Boulder Laboratories, Boulder, Colorado
Synchronization: Direct 1 pps from clock ensemble; lockclock algorithm and ACTS dial-up as backup; DEC Alpha/UNIX
Service Area: NSFnet, WESTnet
Access Policy: Open to stratum-2 servers, others by arrangement; please
use only one of the servers as primary with the other as a backup.
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492 7785.
- US CO time-b.timefreq.bldrdoc.gov (132.163.135.131, 132.163.4.102)
Location: NIST Boulder Laboratories, Boulder, Colorado
Synchronization: Direct 1 pps from clock ensemble; lockclock algorithm and ACTS dial-up as backup; DEC Alpha/UNIX
Service Area: NSFnet, WESTnet
Access Policy: Open to stratum-2 servers, others by arrangement; please
use only one of the servers as primary with the other as a backup.
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492 7785
- US CO time-c.timefreq.bldrdoc.gov (132.163.135.132, 132.163.4.103)
Location: NIST Boulder Laboratories, Boulder, Colorado
Synchronization: Direct 1 pps from clock ensemble; lockclock algorithm and ACTS dial-up as backup; DEC Alpha/UNIX.
Service Area: NSFnet, WESTnet
Access Policy: Open to servers with at least 10 clients; others by
arrangement. please use only one of these servers primary with the
other as backup.
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492 7785.
- US CO time-d.timefreq.bldrdoc.gov (132.163.135.133, 132.163.4.104)
Location: NIST Boulder Laboratories, Boulder, Colorado
Synchronization: interlock algorithm with direct 1 pps from clock ensemble as backup; DEC Alpha/UNIX.
Service Area: NSFnet, WESTnet
Access Policy: Used for testing and algorithm development. NOT for general use.
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492 7785
- US CO time.nist.gov (192.43.244.18)
Location: National Center for Atmospheric Research, Boulder, Colorado
Geographic Coordinates: 39:58:43.44N 254:43:32.5E +1840m (WGS 84)
Synchronization: ACTS dial-up with NTP backup, DEC Alpha UNIX Service Area: NSFnet, WESTnet
Access Policy: open to stratum-2 servers and others by arrangement
Contact: Judah Levine (jlevine@boulder.nist.gov), (303) 492-7785
- US CO utcnist.colorado.edu (128.138.140.44)
Location: JILA Laboratory, University of Colorado
Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX
Service Area: Western US
Access Policy: Open to All Colorado users, other stratum-2 servers; others by arrangement
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492-7785
- US DC ntp2.usno.navy.mil (192.5.41.209)
Location: U.S. Naval Observatory, Washington, DC
Geographic Coordinates: 77 03 57.7W 38 55 14.1N WGS84
Synchronization: NTP V3 primary (USNO Master Clocks 1,2, and GPS)
Service area: USA Eastern timezone, others by arrangement
Access Policy: open access for stratum 2 servers
Contact: Rich Schmidt, US Naval Observatory (res@tuttle.usno.navy.mil)
- US DC tick.usno.navy.mil (192.5.41.40)
Location: U.S. Naval Observatory, Washington, DC
Geographic Coordinates: 38:55:14.01 77:03:58.03 (GPS WGS84)
Synchronization: NTP V3 primary (USNO Master Clock 2, H-maser), HP9000/747i
Service Area: NSFNET
Access Policy: open access
Contact: Rich Schmidt (res@tuttle.usno.navy.mil)
- US DC tock.usno.navy.mil (192.5.41.41)
Location: U.S. Naval Observatory, Washington, DC
Geographic Coordinates: 38:55:14.01 77:03:58.03 (GPS WGS84)
Synchronization: NTP V3 primary (USNO Master Clock 2, H-maser), HP9000/747i
Service Area: NSFNET
Access Policy: open access
Contact: Rich Schmidt (res@tuttle.usno.navy.mil)
- US DE mizbeaver.udel.edu (128.4.1.2)
Location: University of Delaware, Newark, DE
Geographic Coordinates: 39:40:48.425N, 75:45:02.392W (GPS WGS84)
Synchronization: NTP V4 primary (GPS clock), TrueTime NTS-200-GPS
Service Area: CAIRN, Abilene/vBNS
Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts
Contact: Dave Mills <mills@udel.edu>
Note: This server does not implement the NTP control-message protocol
- US DE ntp1.connectiv.com (138.39.7.20)
Location: Conectiv Inc., Newark DE
Synchronization: NTP primary (GPS clock), Odetics GPS Receiver and Sun Sparc 5
Service area: AT&T and QWEST
Access policy: open access
Contact: John K. Scoggin (john.scoggin@conectiv.com)
- US DE ntp1.nss.udel.edu (128.175.60.175)
Location: University of Delaware, Newark, DE
Geographic Coordinates: 39:40:35.8N, 75:44:36.6W (GPS WGS 84)
Synchronization: NTP V3 Primary (GPS clock), TrueTime NTS-100-GPS
Service Area: BBN Planet SER
Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts
Contact: Ron Reisor (ron@udel.edu)
Note: This server does not implement the NTP control-message protocol.
- US DE rackety.udel.edu (128.4.1.1)
Location: University of Delaware, Newark, DE
Geographic Coordinates: 39:40:48.425N, 75:45:02.392W (GPS WGS84)
Synchronization: NTP V4 primary (GPS clock), Sun IPC/SunOS 4.1.3
Service Area: CAIRN, Abilene/vBNS
Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts
Contact: Dave Mills <mills@udel.edu>
Note: service is restricted to NTP Version 4 clients only.
- US FL ntp-s1.cise.ufl.edu (128.227.205.3) (CNAME ntp-ufl.usno.navy.mil)
Location: University of Florida, Gainesville, FL
Synchronization: NTP V3 primary (TrueTime GPS-VME)
Service area: Eastern time zone US
Access Policy: open access for stratum 2 servers and UFL clients,others by arrangement
Contacts: Rich Schmidt, US Naval Observatory
CISE, Univ. Florida
- US GA navobs1.gatech.edu (130.207.244.240) CNAMES: tick.gatech.edu, ntp-gatech.usno.navy.mi
Location: Georgia Institute of Technology, Atlanta, GA
Geographic Coordinates: 84 23 40.9W 33 46 30.0N WGS84
Synchronization: NTP V3 primary (GPS clock)
Service area: USA Eastern timezone, others by arrangement
Access Policy: open access for stratum 2 servers
Contacts: Rich Schmidt, US Naval Observatory
(res@tuttle.usno.navy.mil), Ray Spalding, Georgia Institute of
Technology,(cc100aa@xray.oit.gatech.edu) - US GA time.twc.weather.com (216.133.140.77)
Location: The Weather Channel, Atlanta GA
Geographic Coordinates: 33:53:39.94N, 84:27:47.98W
Synchronization: NTP V4 primary (CMDA), Sun/Solaris
Servcice Area: Primarily Southeastern US
Access policy: Open access for stratum 2 servers
Contact: NTP Administrator
Note: IP addresses are subject to change; please use DNS Important:
Access policies subject to change if server is overloaded or abused. No
access for dial-up or DHCP systems. - US HI tick.mhpcc.hpc.mil (140.31.199.8) (CNAME: ntp-mhpcc.usno.navy.mil)
Location: Maui High Performance Computing Center
Geographic Coordinates: 20 44.9286 N, 156 26.4070 W
Synchronization: NTP V3 primary (Brandywine/Motorola Oncore GPS)
Service area: Hawaii, others on request
Access Policy: open access for stratum 2 servers
Contacts: Rich Schmidt (res@tuttle.usno.navy.mil), MHPCC NTP administrator (ntp@mhpcc.edu)
- US IL ntp0.mcs.anl.gov (140.221.8.88) (CNAME ntp-anl.usno.navy.mil)
Location: Argonne National Laboratories, Chicago, IL
Synchronization: NTP V3 primary (Brandywine Syncclock32/Oncore GPS)
Service area: Central time zone US
Access Policy: open access for stratum 2 servers and ANL clients,others by arrangement
Contacts: Rich Schmidt, US Naval Observatory Bill Nickless, Argonne National Labs
- US IL truechimer.cso.uiuc.edu (128.174.5.58)
Location: University of Illinois, Urbana-Champaign, IL
Synchronization: NTP V3 primary (WWVB clock), IBM-RS6000/250
Service Area: CICNET, Midwest, NCSA region
Access Policy: closed access except for peers that meet the three
conditions outlined in the "Time Servers" section of this file. State
agreement with those conditions in notification message. All others may
use the ntp-{0,1,2}.cso.uiuc.edu stratum 2 servers.
Contact: Charley Kline (kline@uiuc.edu)
Note: truechimer is a DNS CNAME. The host with the WWVB clock will always have the truechimer alias.
- US IN tick.cerias.purdue.edu(128.10.252.7) (alias darkcity.cerias.purdue.edu)
Location: CERIAS, Purdue University, West Lafayette, IN Synchronization: NTP V3/V4
primary (GPS), Symmetricom TymServe 2100L Geographic Coordinates: 40:25:33.2N, 86:54:54.7W (GPS)
Service Area: Internet2, CIC, and midwest US
Access Policy: open access to significant stratum 2 servers in the service areas.
Please send a message to notify, and 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 tock.cerias.purdue.edu(128.10.252.6) (alias caspak.cerias.purdue.edu)
Location: CERIAS, Purdue University, West Lafayette, IN
Synchronization: NTP V3/V4 primary (GPS), Symmetricom TymServe 2100L
Geographic Coordinates: 40:25:33.2N, 86:54:54.7W (GPS)
Service Area: Internet2, CIC, and midwest US
Access Policy: open access to significant stratum 2 servers in the
service areas. Please send a message to notify, and 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 MA bonehed.lcs.mit.edu (18.26.4.105)
Location: Massachusetts Institute of Technology, Cambridge, MA
Synchronization: Motorola Oncore UT+ GPS, xntp3-5.90, FreeBSD 3.2
Service Area: Eastern US
Access Policy: open access
Contact: Robert Morris (rtm@lcs.mit.edu)
- US MA ntp.quidnet.com (140.239.15.7)
Location: Concord, MA
Synchronization: NTP V4 primary, Motorola Oncore VP GPS, Linux
Service Area: Eastern US
Access Policy: open access for stratum 2 servers, please notify
Contact: timekeeper@quidnet.com
- US MA tick.mit.edu (18.145.0.30) CNAME: navobs1.mit.edu
Location: Massachusetts Institute of Technology, Cambridge, MA
Synchronization: NTP V3 primary (GPS) HP9000/747i
Service Area: eastern time zone, others on request
Access Policy: open access to stratum-2 servers and to MIT clients
Contacts: Rich Schmidt (res@tuttle.usno.navy.mil)
- US MA time.keneli.org
Location: Cambridge, MA
Synchronization: Motorola Oncore UT+ GPS, Linux
Service Area: Eastern US
Access Policy: open access
Contact: Kenneth Baker (bakerkj@umich.edu)
Note: IP addresses are subject to change; please use DNS.
- US MA timeserver.cs.umb.edu (158.121.95.4)
Location: University of Massachusetts at Boston
Geographic Coordinates: 42:18:83N, 71:02:36W.
Synchronization: NTP V3/V4 primary (GPS), TrueTime NTS-200
Service Area: New England
Access Policy: Open access to stratum-2 servers in service area; any SOHO's in Massachusetts.
Contact: Rick Martin (ntp@cs.umb.edu)
Note: IP addresses are subject to change; please use DNS.
- US MD time-b.nist.gov (129.6.15.29)
Location: NIST Central Computer Facility, Gaithersburg, Maryland
Synchronization: ACTS dial-up using lockclock algorithm, DEC Alpha/UNIX
Service Area: NSFnet, SURAnet
Access Policy: Open to stratum-2 servers, others by arrangement; please
use one of the servers as primary with the other as a backup.
Contact: Judah Levine (jlevine@boulder`.nist.gov) 303 492 7785
- US MD umd1.umd.edu (128.8.10.1)
Location: University of Maryland, College Park, MD
Synchronization: NTP V3 primary (WWVB clock), Fuzzball
Service Area: NSFNET, SURA region
Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts
Contact: Michael Petry (petry@ni.umd.edu)
- US ME ntp.colby.edu (137.146.210.250) (CNAME ntp-colby.usno.navy.mil)
Location: Colby College, Waterville, ME
Geographic Coordinates: 69 39 42.0 W, 44 33 48 N WGS84
Synchronization: NTP V3 primary (GPS)
Service area: Northeastern US and Canada, others by arrangement
Access Policy: open access for stratum 2 servers
Contacts: Rich Schmidt, US Naval Observatory (res@tuttle.usno.navy.mil), Jeff Earickson, Colby College (jaearick@colby.edu)
Note: IP addresses are subject to change; please use DNS.
- US MO navobs1.wustl.edu (128.252.19.1) CNAME: tick.wustl.edu
Location: Washington University, St. Louis, MO
Synchronization: NTP V3 primary (GPS) HP9000/747i
Service area: USA Central timezone, others by arrangement.
Access Policy: open access
Contact: Rich Schmidt,US Naval Observatory (res@tuttle.usno.navy.mil)
- US NC ncnoc.ncren.net (192.101.21.1)
Location: MCNC, Research Triangle Park, NC
Synchronization: NTP V3 primary (WWVB clock), Netclock/2, Sun 4/65
Service area: NC-REN region
Access Policy: NC-REN region, other use by prior arrangement
Contact: Tim Seaver (tas@ncren.net, clockmaster@ncren.net)
- US NC terrapin.csc.ncsu.edu 152.1.58.124
Location: North Carolina State University, Raleigh, NC
Synchronization: NTP primary (GPS clock), Trimble Palisade
Service Area: South Eastern US
Access Policy: open access
Contact: Sven Dietrich, NCSU, sven@terrapin.csc.ncsu.edu
- US NJ ntp0.jensenresearch.com (65.211.109.12)
Location: Jensen Research Corporation, Oakland NJ
Geographic Coordinates: 41 00.975 N, 74 15.262 W
Synchronization: NTP V4 primary; Pr?cis Ct CDMA clock; Intel PIII/866 Win2K
Service Area: Eastern US
Access Policy: Closed access, except for stratum-2 servers providing
synchronization to local networks of ten or more hosts; others by
arrangement only. 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 NY nist1-ny.glassey.com (208.184.49.9)
Location: Abovenet, New York City, New York
Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX
Service Area: North Eastern US
Access Policy: Open to stratum-2 servers and others by arrangement
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492-7785
- US OH lerc-dns.lerc.nasa.gov (128.156.1.43)
Location: NASA Lewis Research Center, Cleveland, OH
Synchronization: NTP Primary (WWVB clock), Sun/Unix Service Area: NSFNET, OARNET
Access Policy: open access
Contact: Joe Rossoll (yyjer@scivax.lerc.nasa.gov)
- US OK now.okstate.edu (139.78.100.163) CNAME: ntp-okstate.usno.navy.mil
Location: Oklahoma State University, Stillwater, OK
Geographic Coordinates: 97 04 17.0 W, 36 07 19.7 N WGS84
Synchronization: NTP V4 primary (Motorola UT+)
Service area: Central Time Zone, others by arrangement
Access Policy: open access
Contacts: Rich Schmidt, US Naval Observatory
(res@tuttle.usno.navy.mil), Matthew Collier, Oklahoma State University
(mwc@okstate.edu) - US PA gps1.otc.psu.edu (128.118.25.12)
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 primary (GPS), TrueTime XL/DC NTP module
Service Area: Internet2, vBNS, CERFnet(AT& T IP Services), PSC/NCNE, CASC.
Access Policy: closed access, except for stratum-2 servers providing
synchronization to local networks of ten or more hosts; others by
arrangement only
Contact: John Balogh <JDB@psu.edu>
Note: the IP address for gps1.otc.psu.edu may change; please use DNS.
This hardware does not support rdate or daytime protocols; NTPv3 only. - US PA otc1.psu.edu (128.118.46.3)
Location: Penn State University, University Park, PA
Synchronization: NTP V3 primary (WWV clock), Sun/Unix
Service Area: NSFNET, PREPNET, JvNCnet
Access Policy: open access
Contact: John Balogh (JohnBalogh@psu.edu) (no longer: jdb@ecl.psu.edu)
- US PA wwv.otc.psu.edu (128.118.46.3)
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 primary (Traconex/PSTI-1020 WWV clock), 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: wwv.otc.psu.edu is the CNAME for this service. The IP address
WILL change sometime after mid-year 1999; please use DNS. - US TX tick.uh.edu (129.7.1.66) CNAME: time.uh.edu
Location: University of Houston, Houston, TX
Geographic Coordinates: 29:43:37N,95:20:22W
Synchronization: NTP V3 primary (GPS) HP9000/747i
Service Area: US Central time zone, others on request
Access Policy: open access to stratum-2 servers and to UH clients
Contacts: Rich Schmidt (res@tuttle.usno.navy.mil), Alan Pfeiffer-Traum (apt@uh.edu)
- US UT time.xmission.com (198.60.22.240)
Location: XMission Internet, Salt Lake City, Utah
Synchronization: Motorola Oncore UT+ GPS, ntp-4.1.1a, Linux 2.4.18-nano
Service Area: Western US
Access Policy: open access
Contact: ntp@xmission.com
- US VA: nist1.aol-va.truetime.com (64.236.96.53)
Location: AOL Time Warner facility, Dulles, Virginia
Synchronization: Lockclock Algorithm and ACTS dial-up, GPS-stabilized oscillator for short-term stabilization
Service Area: Eastern US
Access Policy: Open access for up to 20 queries per hour (one-day average) from any one address, others by arrangement
Contact: Judah Levine, jlevine@boulder.nist.gov, 303 492 7785
- US VA nist1-dc.glassey.com (216.200.93.8)
Location: Abovenet, Vienna, VA
Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX
Service Area: Primarily networks in Eastern US
Access Policy: Open to stratum-2 servers and others by arrangement.
Contact: Judah Levine (jlevine@boulder.nist.gov) 303 492-7785
- US WA bigben.cac.washington.edu 140.142.16.34 (CNAME ntp-wu.usno.navy.mil)
Location: University of Washington, Seattle, WA
Synchronization: NTP primary (GPS clock), HP9000/747i HPUX
Service Area: Pacific Northwest
Access Policy: open access to Pacific Time Zone stratum 2's and to Univ. of Washington clients; others by arrangement
Contact: Rich Schmidt, USNO, res@tuttle.usno.navy.mil, Bill Mar, Univ. of Washington (bmar@cac.washington.edu)
- US WA time-nw.nist.gov (131.107.1.10)
Location: Microsoft Corporation, Redmond, Washington
Synchronization: ACTS Dial-up and lockclock algorithm, DEC Alpha/UNIX
Service Area: NorthWestNet, NSFnet
Access policy: open to stratum-2 servers and others by arrangement.
Contact: Judah Levine (jlevine@boulder.nist.gov) (303) 492-7785
- US WI ben.cs.wisc.edu (128.105.201.11)
Location: Computer Science Department, University of Wisconsin-Madison
Geographic Coordinates: 89:24:30W, 43:08:00N
Synchronization: NTP V4 primary (Odetics GPS), Sun/Sparc
Service Area: US/any
Access Policy: One primary and one secondary per domain, by request
Contact: David Thompson ( ntp-admin@cs.wisc.edu)
Note: IP addresses are subject to change; please use DNS
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