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NIST Internet Time Servers

 

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. 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.

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

time-a.nist.gov

129.6.15.28

NIST, Gaithersburg , Maryland

time-b.nist.gov

129.6.15.29

NIST, Gaithersburg , Maryland

time-a.timefreq.bldrdoc.gov

132.163.4.101

NIST, Boulder , Colorado

time-b.timefreq.bldrdoc.gov

132.163.4.102

NIST, Boulder , Colorado

time-c.timefreq.bldrdoc.gov

132.163.4.103

NIST, Boulder , Colorado

utcnist.colorado.edu

128.138.140.44

University of Colorado , Boulder

time.nist.gov

192.43.244.18

NCAR, Boulder , Colorado

time-nw.nist.gov

131.107.13.100

Microsoft, Redmond , Washington

nist1.symmetricom.com

69.25.96.13

Symmetricom, San Jose , California

nist1-dc.WiTime.net

206.246.118.250

WiTime , Virginia

nist1-ny.WiTime.net

208.184.49.9

WiTime , New York City

nist1-sj.WiTime.net

64.125.78.85

WiTime, San Jose , California

nist1.aol-ca.symmetricom.com

207.200.81.113

Symmetricom, AOL facility, Sunnyvale , California

nist1.aol-va.symmetricom.com

64.236.96.53

Symmetricom, AOL facility, Virginia

nist1.columbiacountyga.gov

68.216.79.113

Columbia County , Georgia

nist.expertsmi.com

71.13.91.122

Monroe , Michigan

nist.netservicesgroup.com

64.113.32.5

Southfield , Michigan

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