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Setting Your Computer Clock

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You can download software from NIST to use the internet to automatically set your computer clock to Atomic Clock time.


The NIST Internet Time Service (ITS) allows users to synchronize computer clocks via the Internet. The time information provided by the service is directly traceable to UTC(NIST). The service responds to time requests from any Internet client in several formats including the DAYTIME, TIME, and NTP protocols.


Requests in these formats generally do not support authentication, and no keys or passwords are needed to use these services.


In addition to these services (which will not be modified), we have begun testing a server that will provide authenticated NTP messages using a symmetric-key encryption algorithm. This additional service is being offered on an experimental basis only. See the authenticated NTP description for more details.


The NIST Internet Time Service uses multiple stratum-1 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, 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.


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.


nist1-ny.WiTime.net New York City, NY Recommended for new users

time-a.nist.gov NIST, Gaithersburg, Maryland Ok

time-b.nist.gov NIST, Gaithersburg, Maryland Ok

nist1-dc.WiTime.net Alexandria, Virginia Recommended for new users

nist1.aol-va.symmetricom.com Reston, Virginia Recommended for new users

nist1.columbiacountyga.gov Columbia County, Georgia Recommended for new users

nist.expertsmi.com Monroe, Michigan Recommended for new users

nist.netservicesgroup.com Southfield, Michigan Recommended for new users

time-a.timefreq.bldrdoc.gov NIST, Boulder, Colorado Ok

time-b.timefreq.bldrdoc.gov NIST, Boulder, Colorado Very busy

time-c.timefreq.bldrdoc.gov NIST, Boulder, Colorado Ok

time.nist.gov NCAR, Boulder, Colorado Very busy

utcnist.colorado.edu University of Colorado, Boulder ok

utcnist2.colorado.edu University of Colorado, Boulder Recommended for new users

time-nw.nist.gov Microsoft, Redmond, Washington Very busy

nist1.aol-ca.symmetricom.com Mountain View, California Recommended for new users

nist1.symmetricom.com San Jose, California Recommended for new users

nist1-sj.WiTime.net San Jose, California Recommended for new users




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