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NOTICE: NIST has established a mailing list (Google Group) to inform users of status changes of the Internet Time Service.
If you wish to subscribe to this list, please send your name and email address to: internet-time-service@nist.gov
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The table below lists the time servers used by the NIST Internet Time Service (ITS). The table lists each server's name, IP address, and location, organized geographically within the US from North to South and then from East to West. Please note that while we make every effort to ensure that the names of the servers are correct, we control the names of only the nist.gov servers. If you have difficulty using the name of a system, you can access a server using the IP address directly.
Important notes:1. We will continue to support the 'TIME' protocol that uses tcp port 37 for the forseeable future.However, this protocol is very expensive in terms of network bandwidth, since it uses the complete tcpmachinery to transmit only 32 bits of data. Users are *strongly* encouraged to upgrade to the networktime protocol (NTP), which is both more accurate and more robust.
3. The generic name time.nist.gov will continue to point to all of our servers on a round-robin basis,and users are encouraged to access the service using this name.
Please address comments to: internet-time-service@nist.gov
The global address time.nist.gov is resolved to all of the server addresses belowin a round-robin sequence to equalize the load across all of the servers.
Whether you connect to a server using the name or the IP address, it is a bad practice to 'hard-code' a particular server name or address into a device so that these parameters cannot be changed by the end user if that becomes necessary at some future time.
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3. The generic name time.nist.gov will continue to point to all of our servers on a round-robin basis,and users are encouraged to access the service using this name.
Please address comments to: internet-time-service@nist.gov
The global address time.nist.gov is resolved to all of the server addresses belowin a round-robin sequence to equalize the load across all of the servers.
Whether you connect to a server using the name or the IP address, it is a bad practice to 'hard-code' a particular server name or address into a device so that these parameters cannot be changed by the end user if that becomes necessary at some future time.
All users should ensure that their software NEVER queries a server more frequently than once every 4 seconds. Systems that exceed this rate will be refused service. In extreme cases, systems that exceed this limit may be considered as attempting a denial-of-service attack.
Name | IP Address | Location | Status |
time-a-g.nist.gov | 129.6.15.28 | NIST, Gaithersburg, Maryland | All services available |
time-b-g.nist.gov | 129.6.15.29 | NIST, Gaithersburg, Maryland | All services available |
time-c-g.nist.gov | 129.6.15.30 | NIST, Gaithersburg, Maryland | All services available |
time-d-g.nist.gov | 129.6.15.27 | NIST, Gaithersburg, Maryland | All services available |
time-d-g.nist.gov | 2610:20:6f15:15::27 | NIST, Gaithersburg, Maryland | All services via IPV6 |
time-e-g.nist.gov | 129.6.15.26 | NIST, Gaithersburg, Maryland | All services available |
time-e-g.nist.gov | 2610:20:6f15:15::26 | NIST, Gaithersburg, Maryland | All services via IPv6 |
time-a-wwv.nist.gov | 132.163.97.1 | WWV, Fort Collins, Colorado | All services available |
time-b-wwv.nist.gov | 132.163.97.2 | WWV, Fort Collins, Colorado | All services available |
time-c-wwv.nist.gov | 132.163.97.3 | WWV, Fort Collins, Colorado | All services available |
time-d-wwv.nist.gov | 132.163.97.4 | WWV, Fort Collins, Colorado | All services available |
time-d-wwv.nist.gov | 2610:20:6f97:97::4 | WWV, Fort Collins, Colorado | All services via IPv6 |
time-e-wwv.nist.gov | 132.163.97.6 | WWV, Fort Collins, Colorado | All services available |
time-e-wwv.nist.gov | 2610:20:6f97:97::6 | WWV, Fort Collins, Colorado | new server, services via IPV6 |
time-a-b.nist.gov | 132.163.96.1 | NIST, Boulder, Colorado | All services available |
time-b-b.nist.gov | 132.163.96.2 | NIST, Boulder, Colorado | All services available |
time-c-b.nist.gov | 132.163.96.3 | NIST, Boulder, Colorado | All services available |
time-d-b.nist.gov | 132.163.96.4 | NIST, Boulder, Colorado | All services available |
time-d-b.nist.gov | 2610:20:6f96:96::4 | NIST, Boulder, Colorado | All services available |
time-e-b.nist.gov | 132.163.96.6 | NIST, Boulder Colorado | All services available |
time-e-b.nist.gov | 2610:20:6f96:96::6 | NIST, Boulder, Colorado | All services available |
time.nist.gov | global address for all servers | Multiple locations | All services available |
utcnist.colorado.edu | 128.138.140.44 | University of Colorado, Boulder | All services available |
utcnist2.colorado.edu | 128.138.141.172 | University of Colorado, Boulder | All services available |
Internet Status 4 98 Fm Radio
Asana free. The following servers support only authenticated NTP requests using the symmetric key encryption method that is defined in the NTP documentation.They do not respond to requests for time in the DAYTIME or TIME formats and will not accept anonymous ftp connections.You must apply to NIST for an encryption key to use these systems; they will not respond to NTP requests from users who have not registered with NIST.See the authenticated NTP description for more information.
Name | IP Address | Location | Status |
ntp-b.nist.gov | 132.163.96.5 | NIST, Boulder, Colorado | Authenticated service |
ntp-wwv.nist.gov | 132.163.97.5 | NIST WWV, Fort Collins, Colorado | Authenticated service |
ntp-c.colorado.edu | 128.138.141.177 | JILA, Univ. of Colorado, Boulder | Authenticated service |
ntp-d.nist.gov | 129.6.15.32 | NIST, Gaithersburg, Maryland | Authenticated service |
Internet Status 4 98 Fm Radio
The following server supports only the NTP format and transmits UT1 time rather than UTC(NIST).For details about the UT1 server, please see the UT1 NTP Information page.
ut1-time.colorado.edu | 128.138.140.50 | University of Colorado, Boulder |
ut1-wwv.nist.gov | 132.163.97.7 | NIST WWV Radio, Ft. Collins, CO |