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Matt Nordhoffmnordhoff@infosec.exchange
Dec 9, 2025, 11:18 AM
This is, by the way, less than a month after the time servers hosted at JILA/University of Colorado were turned off due to failure of the atomic clock there.
https://groups.google.com/a/list.nist.gov/g/internet-time-service/c/y0smqm7W1J4
So NIST is down to 2 sites at the moment, also in Colorado.
USNO (the military) also has public stratum 1 NTP servers in two other locations (one of which is in Colorado because everyone loves Colorado), and of course there are many other stratum 1 time servers in the United States (probably mostly using GPS/GNSS).
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Replies

Matt Nordhoffmnordhoff@infosec.exchange
Dec 9, 2025, 10:32 PM
I think NIST fixed the Gaithersburg, MD, US NTP servers. Or at least time-d-g.nist.gov, I didn't check the others.
UTC time and offset:
```
2025-12-09 21:59:52  10 ms
2025-12-09 22:00:56  10 ms
2025-12-09 22:02:00  2 ms
2025-12-09 22:03:05  0.5 ms
2025-12-09 22:04:09  -0.9 ms
2025-12-09 22:05:14  -0.9 ms
```
The status page said (and still says) "ETA repair 9 Dec 2025" but I didn't want to, like, apply pressure by publicizing it.
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Matt Nordhoffmnordhoff@infosec.exchange
Dec 9, 2025, 11:35 PM
https://tf.nist.gov/tf-cgi/servers.cgi has been updated to say Gaithersburg is normal.
Bonus: They also added IPv6 to time-f-g.nist.gov.
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Matt Nordhoffmnordhoff@infosec.exchange
Dec 9, 2025, 11:58 PM
time.cloudflare.com is also back to its normal accuracy now from my perspective(s).
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Tony Finchfanf@mendeddrum.org
Dec 10, 2025, 12:46 AM
@mnordhoff usno alternate master clock is at schriever space force base in colorado where it provides the reference timescale for gps whose ground operations are located there
dunno how much of a coincidence it is that nist and schriever are relatively close to each other
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Matt Nordhoffmnordhoff@infosec.exchange
Dec 10, 2025, 8:01 AM
@fanf Yeah, I don't know either.
At least part of it is that NIST's WWV/WWVB time radio station—one of the time server locations—is also in Colorado, but I don't know how much of a coincidence that is.
I have 6-7 Wikipedia tabs open now, but who knows. :blobsmile:
Bringing it together, NIST used to have a time server in Hawaii, where they have the WWVH radio signal, which is located at a US Navy missile range.
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