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NIST
Internet Time Servers
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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. 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.
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Name
|
IP Address
|
Location
|
|
time-a.nist.gov
|
129.6.15.28
|
NIST,
Gaithersburg
,
Maryland
|
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time-b.nist.gov
|
129.6.15.29
|
NIST,
Gaithersburg
,
Maryland
|
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time-a.timefreq.bldrdoc.gov
|
132.163.4.101
|
NIST,
Boulder
,
Colorado
|
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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
|
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time.nist.gov
|
192.43.244.18
|
NCAR,
Boulder
,
Colorado
|
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time-nw.nist.gov
|
131.107.13.100
|
Microsoft,
Redmond
,
Washington
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nist1.symmetricom.com
|
69.25.96.13
|
Symmetricom,
San Jose
,
California
|
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nist1-dc.WiTime.net
|
206.246.118.250
|
WiTime
,
Virginia
|
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nist1-ny.WiTime.net
|
208.184.49.9
|
WiTime
,
New York
City
|
|
nist1-sj.WiTime.net
|
64.125.78.85
|
WiTime,
San Jose
,
California
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nist1.aol-ca.symmetricom.com
|
207.200.81.113
|
Symmetricom, AOL facility,
Sunnyvale
,
California
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nist1.aol-va.symmetricom.com
|
64.236.96.53
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Symmetricom, AOL facility,
Virginia
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nist1.columbiacountyga.gov
|
68.216.79.113
|
Columbia County
,
Georgia
|
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nist.expertsmi.com
|
71.13.91.122
|
Monroe
,
Michigan
|
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nist.netservicesgroup.com
|
64.113.32.5
|
Southfield
,
Michigan
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