WARNING: There is no endorsement of any server included in this list. Please carefully vet before usage.
This is intended to bootstrap a list of NTP servers with NTS support given that NTS support is not currently widespread. Visit the companion repo of public NTP servers.
- Pull requests are welcome to add new sources (signed commits are preferred)
- PR will not be merged until connectivity to server can be verified. Scripts are available in the
scripts/subfolder to assist with this - New entries should be grouped by location then in alphabetical order
- Please specify if server is virtualized
- Contributions and updates to the list are welcome via pull requests to nts-sources.yml to modify the
README.md,chrony.conf, andntp.toml- Run
./scripts/ntsServerConverter.py nts-sources.ymlto update the other files after changing nts-sources.yml - Use
git diff origin README.md chrony.conf ntp.tomlto verify that you have a clean update before submitting a PR
- Run
- AI generated documentation: https://deepwiki.com/jauderho/nts-servers
- This repository provides NTS server lists in multiple formats:
- For use with chrony - chrony.conf
- For use with ntpd-rs - ntp.toml
- 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 before submitting a pull request
./scripts/ntsCheck.sh <NTS_SERVER_NAME>
| Hostname | Stratum | Location | Owner | Notes |
|---|---|---|---|---|
| time.cloudflare.com | 3 | All | Cloudflare | Anycast |
| any.time.nl | 2 | All | TimeNL | Anycast |
| 1.ntp.ubuntu.com | 2 | Distro | Ubuntu | Distro use only |
| 2.ntp.ubuntu.com | 2 | Distro | Ubuntu | Distro use only |
| 3.ntp.ubuntu.com | 2 | Distro | Ubuntu | Distro use only |
| 4.ntp.ubuntu.com | 2 | Distro | Ubuntu | Distro use only |
| 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 | 2 | Brazil | ntp.br | |
| gps.ntp.br | 1 | Brazil | ntp.br | |
| brazil.time.system76.com | 2 | Brazil | System76 | |
| time.bolha.one | 1 | Brazil | Bolhinha | |
| time1.mbix.ca | 1 | Canada | Manitoba Internet Exchange | IPv4 and IPv6 |
| time2.mbix.ca | 1 | Canada | Manitoba Internet Exchange | IPv4 and IPv6 |
| time3.mbix.ca | 1 | Canada | Manitoba Internet Exchange | IPv4 and IPv6 |
| time.web-clock.ca | 1 | Canada | Community | |
| ntp.neu.edu.cn | 1 | China | Northeastern University | |
| ntp1.neu.edu.cn | 1 | China | Northeastern University | |
| nts1.ntp.hr | 1 | Croatia | UNIZG FER REMLAB | rem.fer.hr |
| nts2.ntp.hr | 1 | Croatia | UNIZG FER REMLAB | rem.fer.hr |
| time.cincura.net | 1 | Czech Republic | Jiří Činčura | IPv4 and IPv6 |
| ntp.miuku.net | 3 | Finland | miuku.net | |
| ntp.obspm.fr | 2 | France | Paris Observatory | |
| paris.time.system76.com | 2 | France | System76 | |
| ntp-0-gps-hq.rdem-systems.com | 1 | France | RDEM Systems | GPS, IPv6 only (IPv4 via ntp-0-hq.rdem-systems.com) |
| ntp-0-gnss-hq.rdem-systems.com | 1 | France | RDEM Systems | GNSS (Galileo, GLONASS), IPv6 only (IPv4 via ntp-0-hq.rdem-systems.com) |
| ntp3.fau.de | 1 | Germany | FAU | |
| ntp3.ipv6.fau.de | 1 | Germany | FAU | IPv6 only |
| ntp7.rdem-systems.com | 2 | Germany | RDEM Systems | Frankfurt area, IPv4 and IPv6 |
| ntp13.rdem-systems.com | 2 | Germany | RDEM Systems | Frankfurt area, IPv4 and IPv6 |
| 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 | IPv4 and IPv6 |
| 1.nts.nothingtohide.nl | 2 | Netherlands | Nothing to hide | IPv4 and IPv6 |
| 2.nts.nothingtohide.nl | 2 | Netherlands | Nothing to hide | IPv4 and IPv6 |
| 3.nts.nothingtohide.nl | 2 | Netherlands | Nothing to hide | IPv4 and IPv6 |
| 4.nts.nothingtohide.nl | 2 | Netherlands | Nothing to hide | IPv4 and IPv6 |
| ntppool1.time.nl | 1 | Netherlands | TimeNL | Part of ntspool.time.nl |
| ntppool2.time.nl | 1 | Netherlands | TimeNL | Part of ntspool.time.nl |
| ntppool3.time.nl | 1 | Netherlands | TimeNL | Part of ntspool.time.nl |
| ntppool4.time.nl | 1 | Netherlands | TimeNL | Part of ntspool.time.nl |
| nts.decepticon.space | 1 | Netherlands | Rick Betting | |
| 0.ntp.bksp.in | 1 | Russia | B4CKSP4CE | |
| ntpmon.dcs1.biz | 3 | Singapore | Sanjeev Gupta | |
| ntp.movi2.net | 1 | Spain | Víctor Soriano | GPS/PPS, IPv4 |
| nts.netnod.se | 1 | Sweden | Netnod | Anycast |
| gbg1.nts.netnod.se | 1 | Sweden | Netnod | For users near Göteborg |
| gbg2.nts.netnod.se | 1 | Sweden | Netnod | For users near Göteborg |
| lul1.nts.netnod.se | 1 | Sweden | Netnod | For users near Luleå |
| lul2.nts.netnod.se | 1 | Sweden | Netnod | For users near Luleå |
| mmo1.nts.netnod.se | 1 | Sweden | Netnod | For users near Malmö |
| mmo2.nts.netnod.se | 1 | Sweden | Netnod | For users near Malmö |
| sth1.nts.netnod.se | 1 | Sweden | Netnod | For users near Stockholm |
| sth2.nts.netnod.se | 1 | Sweden | Netnod | For users near Stockholm |
| svl1.nts.netnod.se | 1 | Sweden | Netnod | For users near Sundsvall |
| svl2.nts.netnod.se | 1 | Sweden | Netnod | For users near Sundsvall |
| mirror.mdapi.ch | 1 | Switzerland | Martino Dell'Ambrogio | |
| ntp.3eck.net | 3 | Switzerland | Adrian Zaugg | |
| ntp.trifence.ch | 2 | Switzerland | Marcel Waldvogel | |
| ntp.zeitgitter.net | 2 | Switzerland | Marcel Waldvogel | |
| ntp01.maillink.ch | 1 | Switzerland | Ueli Heuer | |
| ntp02.maillink.ch | 1 | Switzerland | Ueli Heuer | |
| ntp03.maillink.ch | 1 | Switzerland | Ueli Heuer | |
| time.signorini.ch | 1 | Switzerland | Attilio Signorini | |
| ntp2.glypnod.com | 2 | UK | Hal Murray | London |
| ntp1.dmz.terryburton.co.uk | 1 | UK | Terry Burton | IPv4 and IPv6 |
| ntp2.dmz.terryburton.co.uk | 1 | UK | Terry Burton | IPv4 and IPv6 |
| ntp0.cam.ac.uk | 2 | UK | University of Cambridge, University Information Services (UIS) | IPv4 and IPv6 |
| ntp1.cam.ac.uk | 2 | UK | University of Cambridge, University Information Services (UIS) | IPv4 and IPv6 |
| ntp2.cam.ac.uk | 2 | UK | University of Cambridge, Department of Engineering | IPv4 and IPv6 |
| ntp3.cam.ac.uk | 2 | UK | University of Cambridge, University Information Services (UIS) | IPv4 and IPv6 |
| nts.amethyst.name | 2 | US | Naomi Persephone Amethyst (AS53546) | Raleigh, NC |
| 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-gps.globalentry.systems | 2 | US | Global Entry Systems | Colorado. GPS/PPS stratum 1 upstream |
| time.cifelli.xyz | 2 | US | Mike Cifelli | |
| time.sshlab.net | 2 | US | Z&D | Pennsylvania, NIST/USNO upstream |
| time.txryan.com | 2 | US | Tanner Ryan | |
| ntp1.wiktel.com | 1 | US | Wikstrom Telephone Company | IPv4 and IPv6 |
| ntp2.wiktel.com | 1 | US | Wikstrom Telephone Company | IPv4 and IPv6 |
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 | |
| ntp1.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA4, IPv4 and IPv6 |
| ntp10.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA3, IPv4 and IPv6 |
| ntp11.rdem-systems.com | 2 | France | RDEM Systems | TH2 Paris, IPv4 and IPv6 |
| ntp12.rdem-systems.com | 2 | France | RDEM Systems | Lauterbourg, IPv4 and IPv6 |
| ntp14.rdem-systems.com | 2 | France | RDEM Systems | Lyon, IPv4 and IPv6 |
| ntp15.rdem-systems.com | 2 | France | RDEM Systems | Valence, IPv4 and IPv6 |
| ntp16.rdem-systems.com | 2 | France | RDEM Systems | Paris, IPv4 and IPv6 |
| ntp2.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA4, IPv4 and IPv6 |
| ntp3.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA3, IPv4 and IPv6 |
| ntp4.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA3, IPv4 and IPv6 |
| ntp5.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA5, IPv4 and IPv6 |
| ntp6.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA5, IPv4 and IPv6 |
| ntp8.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA5, IPv4 and IPv6 |
| ntp9.rdem-systems.com | 2 | France | RDEM Systems | Equinix PA4, IPv4 and IPv6 |
| ntp-jp.aki.quest | 2 | Japan | aki | Osaka, IPv4 |
| ntp-sg.aki.quest | 2 | Singapore | aki | IPv4 |
| solarium.stellata.ch | 2 | Switzerland | stellata.ch | |
| beatquantum.com | 2 | UK | BeatQuantum | IPv4 and IPv6, Pure/Hybrid PQC NTS-KE |
| ntp-us.aki.quest | 2 | US | aki | Phoenix, IPv4 and IPv6 |
| nts.dogporkcow.com | 2 | US | dogporkcow | US East |
| time.globalentry.systems | 2 | US | Global Entry Systems | Chicago |
| time.xargs.org | 3 | US | Michael Driscoll | IPv4 and IPv6 |