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NTP servers with NTS support

OpenSSF Scorecard

This is intended to bootstrap a list of NTP servers with NTS support given that NTS support is not currently widespread.

Contribute

  • Pull requests are welcome to add new sources (signed commits are preferred)
  • PR will not be merged until connectivity to server can be verified
  • Please specify if server is virtualized
  • You can now update nts-sources.yml to modify both the README.md and chrony.conf
    • Run ./scripts/ntpServerConverter.py nts-sources.yml
    • Use git diff origin README.md chrony.conf to verify that you have a clean update before submitting a PR

Usage

  • There is no endorsement of any particular server. Please carefully vet before usage
  • Before using anycast NTP servers, make sure that you understand the limitations
  • Use at least 4 time sources as a best practice. No more than 10 should be used
  • It is not possible to mix and match NTP and NTS at this time. Only NTS servers should be specified as the NTP entries will not be used
  • Generally, virtualized systems do not make for good time sources as there is too much jitter. Submissions should strive to ensure that high quality time is available
  • Verify NTS server connectivity using the following command
    • ./scripts/ntsCheck.sh <NTS_SERVER_NAME>

The List

Hostname Stratum Location Owner Notes
time.cloudflare.com 3 All Cloudflare Anycast
nts.teambelgium.net 1 Belgium Team Belgium
a.st1.ntp.br 1 Brazil ntp.br
b.st1.ntp.br 1 Brazil ntp.br
c.st1.ntp.br 1 Brazil ntp.br
d.st1.ntp.br 1 Brazil ntp.br
gps.ntp.br 1 Brazil ntp.br
brazil.time.system76.com 2 Brazil System76
time.bolha.one 1 Brazil Cadu Silva
ntp.miuku.net 3 Finland miuku.net
paris.time.system76.com 2 France System76
ntp3.fau.de 1 Germany FAU
ntp3.ipv6.fau.de 1 Germany FAU IPv6 only
ptbtime1.ptb.de 1 Germany PTB
ptbtime2.ptb.de 1 Germany PTB
ptbtime3.ptb.de 1 Germany PTB
ptbtime4.ptb.de 1 Germany PTB
www.jabber-germany.de 2 Germany Jörg Morbitzer
www.masters-of-cloud.de 2 Germany Jörg Morbitzer
ntp.nanosrvr.cloud 1 Germany Michael Byczkowski
ntppool1.time.nl 1 Netherlands TimeNL
ntppool2.time.nl 1 Netherlands TimeNL
ntpmon.dcs1.biz 1 Singapore Sanjeev Gupta
nts.netnod.se 1 Sweden Netnod Anycast
gbg1.nts.netnod.se 1 Sweden Netnod For users close to Göteborg
gbg2.nts.netnod.se 1 Sweden Netnod For users close to Göteborg
lul1.nts.netnod.se 1 Sweden Netnod For users close to Luleå
lul2.nts.netnod.se 1 Sweden Netnod For users close to Luleå
mmo1.nts.netnod.se 1 Sweden Netnod For users close to Malmö
mmo2.nts.netnod.se 1 Sweden Netnod For users close to Malmö
sth1.nts.netnod.se 1 Sweden Netnod For users close to Stockholm
sth2.nts.netnod.se 1 Sweden Netnod For users close to Stockholm
svl1.nts.netnod.se 1 Sweden Netnod For users close to Sundsvall
svl2.nts.netnod.se 1 Sweden Netnod For users close to Sundsvall
ntp.3eck.net 2 Switzerland Adrian Zaugg
ntp.trifence.ch 2 Switzerland Marcel Waldvogel
ntp.zeitgitter.net 2 Switzerland Marcel Waldvogel
time.signorini.ch 1 Switzerland Attilio Signorini
ntp2.glypnod.com 2 UK Hal Murray London
ntp1.glypnod.com 2 US Hal Murray San Francisco
ohio.time.system76.com 2 US System76
oregon.time.system76.com 2 US System76
virginia.time.system76.com 2 US System76
stratum1.time.cifelli.xyz 1 US Mike Cifelli
time.cifelli.xyz 2 US Mike Cifelli
time.txryan.com 2 US Tanner Ryan

The following servers are known to be virtualized and may be less accurate. YMMV.

Hostname Stratum Location Owner Notes
ntp.viarouge.net 2 France Hubert Viarouge
time.xargs.org 2 US Michael Driscoll IPv4 and IPv6

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