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Welcome to the internet time service
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jeff.s...@nist.gov
Dec 8
Atomic time source failure at NIST Gaithersburg campus
Dear colleagues, On Saturday, 6 December 2025 at approximately 21:13 UTC, the atomic time source (a
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Atomic time source failure at NIST Gaithersburg campus
Dear colleagues, On Saturday, 6 December 2025 at approximately 21:13 UTC, the atomic time source (a
Dec 8
jeff.s...@nist.gov
Nov 13
Shutdown of servers at JILA/University of Colorado due to failed atomic clock
Dear colleagues, Recently the atomic clock housed at JILA/University of Colorado failed with a
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Shutdown of servers at JILA/University of Colorado due to failed atomic clock
Dear colleagues, Recently the atomic clock housed at JILA/University of Colorado failed with a
Nov 13
jeff.s...@nist.gov
Nov 5
New experimental NTP server time-f-g.nist.gov available
Dear colleagues, NIST has recently deployed a public time server at its Gaithersburg, MD campus
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New experimental NTP server time-f-g.nist.gov available
Dear colleagues, NIST has recently deployed a public time server at its Gaithersburg, MD campus
Nov 5
jeff.s...@nist.gov
Oct 17
DNS migration of time.nist.gov
Hello, NIST is planning a change in the domain name system (DNS) implementation of the time.nist.gov
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DNS migration of time.nist.gov
Hello, NIST is planning a change in the domain name system (DNS) implementation of the time.nist.gov
Oct 17
Judah Levine
May 21
Shutdown of some servers
The time servers at the JILA/University of Colorado site with IP addresses 128.138.xy will be
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Shutdown of some servers
The time servers at the JILA/University of Colorado site with IP addresses 128.138.xy will be
May 21
Judah Levine
May 13
power outage
Hello, The electrical power to some of the buildings of the NIST Boulder laboratories will be turned
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power outage
Hello, The electrical power to some of the buildings of the NIST Boulder laboratories will be turned
May 13
Judah Levine
12/10/24
Software upgrade, part 2
The time servers at NIST/Boulder will be down for a software upgrade tomorrow (11 December) starting
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Software upgrade, part 2
The time servers at NIST/Boulder will be down for a software upgrade tomorrow (11 December) starting
12/10/24
Judah Levine
12/5/24
Software upgrade
the time servers at NIST/Boulder with IP addresses 132.163.96.x will be down for a software upgrade
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Software upgrade
the time servers at NIST/Boulder with IP addresses 132.163.96.x will be down for a software upgrade
12/5/24
Judah Levine
12/2/24
Software upgarde
The NIST time servers will be down for a few hours for a software upgrade. The servers at NIST
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Software upgarde
The NIST time servers will be down for a few hours for a software upgrade. The servers at NIST
12/2/24
Judah Levine
7/31/24
WWV servers not available
The network connection to the servers at WWV (IP 132.163.97.x) will be upgraded tomorrow (1 August
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WWV servers not available
The network connection to the servers at WWV (IP 132.163.97.x) will be upgraded tomorrow (1 August
7/31/24
Judah Levine
6/12/24
UTCNIST3 (128.138.140.211) repaired
The time server hardware (IP 128.138.140.211) has been repaired and the system is now available for
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UTCNIST3 (128.138.140.211) repaired
The time server hardware (IP 128.138.140.211) has been repaired and the system is now available for
6/12/24
Judah Levine
6/7/24
Hardware failure
Dear colleagues, The hardware that supports the time server UTCNIST3 (128.138.140.211) has failed. It
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Hardware failure
Dear colleagues, The hardware that supports the time server UTCNIST3 (128.138.140.211) has failed. It
6/7/24
Judah Levine
5/22/24
Additional Time server at WWV/Fort Collins
Dear Colleagues, I have installed an additional time server at WWV. Its name is time-f.nist.gov and
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Additional Time server at WWV/Fort Collins
Dear Colleagues, I have installed an additional time server at WWV. Its name is time-f.nist.gov and
5/22/24
Judah Levine
5/16/24
Possible outage of Boulder servers
Dear colleagues, The power to the NIST Boulder site will be turned off for maintenance this weekend,
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Possible outage of Boulder servers
Dear colleagues, The power to the NIST Boulder site will be turned off for maintenance this weekend,
5/16/24
Judah Levine
2/27/24
Hardware failure
Dear colleagues, The hardware that supports the time servers at address 128.138.140.211 has failed,
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Hardware failure
Dear colleagues, The hardware that supports the time servers at address 128.138.140.211 has failed,
2/27/24
Judah Levine
12/20/23
Urgent repairs
The time servers at the NIST sites will be down for a few hours for urgent repairs. This will affect
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Urgent repairs
The time servers at the NIST sites will be down for a few hours for urgent repairs. This will affect
12/20/23
Judah Levine
12/9/23
maintenance outage
Dear colleagues, The time servers at NIST/Boulder with IP addresses 132.163.96.x will be down for
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maintenance outage
Dear colleagues, The time servers at NIST/Boulder with IP addresses 132.163.96.x will be down for
12/9/23
Judah Levine
10/22/23
Gaithersburg service restored
The servers at NIST/Gaithersburg are now up and running normally. Judah Levine
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Gaithersburg service restored
The servers at NIST/Gaithersburg are now up and running normally. Judah Levine
10/22/23
Judah Levine
10/15/23
Gaithersburg outage
Dear colleague, The computing center in NIST Gaithersburg will be shutdown for maintenance next
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Gaithersburg outage
Dear colleague, The computing center in NIST Gaithersburg will be shutdown for maintenance next
10/15/23
Judah Levine
7/19/23
Time service from WWV
Dear colleagues, The power to the WWV site will be turned off tomorrow morning (Thursday, 20 July)
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Time service from WWV
Dear colleagues, The power to the WWV site will be turned off tomorrow morning (Thursday, 20 July)
7/19/23
Judah Levine
6/16/23
Reminder-Gaithersburg systems down today
Dear colleagues, All of the time servers at NIST/Gaithersburg (IP 129.6.15.x) will not be available
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Reminder-Gaithersburg systems down today
Dear colleagues, All of the time servers at NIST/Gaithersburg (IP 129.6.15.x) will not be available
6/16/23
Judah Levine
6/7/23
Gaithersburg Time server maintenance
Dear colleagues, All of the time servers at NIST/Gaithersburg (IP 129.6.15.x) will not be available
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Gaithersburg Time server maintenance
Dear colleagues, All of the time servers at NIST/Gaithersburg (IP 129.6.15.x) will not be available
6/7/23
Judah Levine
5/1/23
Unplanned outage of NIST/Boulder servers
The link to the reference time scale failed yesterday (Sunday) and the time servers at NIST/Boulder (
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Unplanned outage of NIST/Boulder servers
The link to the reference time scale failed yesterday (Sunday) and the time servers at NIST/Boulder (
5/1/23
Judah Levine
4/3/23
Network repaired
The network connection to the time servers at NIST/Boulder (IP 132.163.96.x) was repaired and the
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Network repaired
The network connection to the time servers at NIST/Boulder (IP 132.163.96.x) was repaired and the
4/3/23
Judah Levine
4/3/23
Network failure
Hello, the network connection that supports the time servers at NSIT Boulder (IP addresses 132.163.96
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Network failure
Hello, the network connection that supports the time servers at NSIT Boulder (IP addresses 132.163.96
4/3/23
Judah Levine
3/9/23
Requesting Assistance
Dear Colleagues, I have received a number of reports of no response to a request for time to one of
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Requesting Assistance
Dear Colleagues, I have received a number of reports of no response to a request for time to one of
3/9/23
Judah Levine
2/26/23
Time Servers at WWV/Fort Collins
The time servers at radio station WWV (IP addresses 132.163.97.x) will be down for maintenance for
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Time Servers at WWV/Fort Collins
The time servers at radio station WWV (IP addresses 132.163.97.x) will be down for maintenance for
2/26/23
Judah Levine
2/17/23
Gaithersburg time servers down
The servers at NIST in Gaithersburg (129.6.15.x) are not available. The problem should be fixed in a
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Gaithersburg time servers down
The servers at NIST in Gaithersburg (129.6.15.x) are not available. The problem should be fixed in a
2/17/23
Judah Levine
10/27/22
Additional time server
Dear colleagues, I have added an additional time server to the systems at the University of Colorado.
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Additional time server
Dear colleagues, I have added an additional time server to the systems at the University of Colorado.
10/27/22
Judah Levine
8/17/22
wwv-time-d repaired
The time-d system has been repaired and is now available for service. Judah Levine
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wwv-time-d repaired
The time-d system has been repaired and is now available for service. Judah Levine
8/17/22
