---
layout: page
title: NTP servers
permalink: /blog/ntp-servers/
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lang: en
date: 2023-07-18 00:00:00 +0100
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---

## Global

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `pool.ntp.org` | No | IPv4 / Partial IPv6 | [Various](https://www.ntppool.org/) | Pool of several global name servers |
| `0.pool.ntp.org` | No | IPv4 / Partial IPv6 | [Various](https://www.ntppool.org/) | Pool of several global name servers |
| `1.pool.ntp.org` | No | IPv4 / Partial IPv6 | [Various](https://www.ntppool.org/) | Pool of several global name servers |
| `2.pool.ntp.org` | No | IPv4 / Partial IPv6 | [Various](https://www.ntppool.org/) | Pool of several global name servers |
| `3.pool.ntp.org` | No | IPv4 / Partial IPv6 | [Various](https://www.ntppool.org/) | Pool of several global name servers |
| `time.cloudflare.com` | Yes | IPv4 / IPv6 | [Cloudflare](https://developers.cloudflare.com/time-services/ntp/usage/) | |
| `time.google.com` | No | IPv4 / IPv6 | [Google](https://developers.google.com/time) | Uses leap smear |
| `time1.google.com` | No | IPv4 / IPv6 | [Google](https://developers.google.com/time) | Uses leap smear |
| `time2.google.com` | No | IPv4 / IPv6 | [Google](https://developers.google.com/time) | Uses leap smear |
| `time3.google.com` | No | IPv4 / IPv6 | [Google](https://developers.google.com/time) | Uses leap smear |
| `time4.google.com` | No | IPv4 / IPv6 | [Google](https://developers.google.com/time) | Uses leap smear |

## Europe

### Germany

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `ptbtime1.ptb.de` | Yes | IPv4 / IPv6 | [Physikalisch-Technische Bundesanstalt (PTB)](https://www.ptb.de/cms/ptb/fachabteilungen/abtq/gruppe-q4/ref-q42/zeitsynchronisation-von-rechnern-mit-hilfe-des-network-time-protocol-ntp.html) | |
| `ptbtime2.ptb.de` | Yes | IPv4 / IPv6 | [Physikalisch-Technische Bundesanstalt (PTB)](https://www.ptb.de/cms/ptb/fachabteilungen/abtq/gruppe-q4/ref-q42/zeitsynchronisation-von-rechnern-mit-hilfe-des-network-time-protocol-ntp.html) | |
| `ptbtime3.ptb.de` | Yes | IPv4 / IPv6 | [Physikalisch-Technische Bundesanstalt (PTB)](https://www.ptb.de/cms/ptb/fachabteilungen/abtq/gruppe-q4/ref-q42/zeitsynchronisation-von-rechnern-mit-hilfe-des-network-time-protocol-ntp.html) | |
| `ptbtime4.ptb.de` | Yes | IPv4 / IPv6 | [Physikalisch-Technische Bundesanstalt (PTB)](https://www.ptb.de/cms/ptb/fachabteilungen/abtq/gruppe-q4/ref-q42/zeitsynchronisation-von-rechnern-mit-hilfe-des-network-time-protocol-ntp.html) | |
| `ntp0.fau.de` | Yes | IPv4 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |
| `ntp0.ipv6.fau.de` | Yes | IPv6 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |
| `ntp1.fau.de` | No | IPv4 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |
| `ntp1.ipv6.fau.de` | No | IPv6 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |
| `ntp2.fau.de` | No | IPv4 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |
| `ntp2.ipv6.fau.de` | No | IPv6 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |
| `ntp3.fau.de` | Yes | IPv4 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |
| `ntp3.ipv6.fau.de` | Yes | IPv6 | [Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)](https://www.rrze.fau.de/serverdienste/infrastruktur/zeitserver/) | |

### Austria

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `bevtime1.metrologie.at` | Yes | IPv4 | [Bundesamt für Eich- und Vermessungswesen](https://www.bev.gv.at/Themen/Mess-und-Eichwesen/Messtechnische-Fachbereiche/Zeitdienste/Zeitsynchronisation-Internet.html) |
| `bevtime2.metrologie.at` | Yes | IPv4 | [Bundesamt für Eich- und Vermessungswesen](https://www.bev.gv.at/Themen/Mess-und-Eichwesen/Messtechnische-Fachbereiche/Zeitdienste/Zeitsynchronisation-Internet.html) |
| `time.metrologie.at` | Yes | IPv4 | [Bundesamt für Eich- und Vermessungswesen](https://www.bev.gv.at/Themen/Mess-und-Eichwesen/Messtechnische-Fachbereiche/Zeitdienste/Zeitsynchronisation-Internet.html) |

### Netherlands

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `ntppool1.time.nl` | Yes | IPv4 / IPv6 | [SIDN Labs](https://time.nl/) |
| `ntppool2.time.nl` | Yes | IPv4 / IPv6 | [SIDN Labs](https://time.nl/) |

### Switzerland

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `ntp.metas.ch` | No | IPv4 | [Federal Institute of Metrology METAS](https://www.metas.ch/metas/en/home/fabe/zeit-und-frequenz/time-dissemination.html) | |
| `ntp11.metas.ch` | No | IPv4 | [Federal Institute of Metrology METAS](https://www.metas.ch/metas/en/home/fabe/zeit-und-frequenz/time-dissemination.html) | |
| `ntp12.metas.ch` | No | IPv4 | [Federal Institute of Metrology METAS](https://www.metas.ch/metas/en/home/fabe/zeit-und-frequenz/time-dissemination.html) | |
| `ntp13.metas.ch` | No | IPv4 | [Federal Institute of Metrology METAS](https://www.metas.ch/metas/en/home/fabe/zeit-und-frequenz/time-dissemination.html) | |

### France

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `paris.time.system76.com` | Yes | IPv4 / IPv6 | [system76](https://system76.com/time/) | |

### Denmark

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `time.dfm.dk` | Yes | IPv4 | [Danish National Metrology Institute](https://dfm.dk/en/ntp/) | |

## Asia

### Japan

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `ntp.nict.jp` | No | IPv4 / IPv6 | [National Institute of Information and Communications Technology](https://www.nict.go.jp/en/sts/ntp.html) | |

## North America

### USA

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `clock.sjc.he.net` | No | IPv4 / IPv6 | [Hurricane Electric](https://www.he.net/adm/ntp.html) | San Jose, California |
| `clock.fmt.he.net` | No | IPv4 / IPv6 | [Hurricane Electric](https://www.he.net/adm/ntp.html) | Fremont, California |
| `clock.nyc.he.net` | No | IPv4 / IPv6 | [Hurricane Electric](https://www.he.net/adm/ntp.html) | New York City, New York |
| `virginia.time.system76.com` | Yes | IPv4 / IPv6 | [system76](https://system76.com/time/) | Virginia |
| `ohio.time.system76.com` | Yes | IPv4 / IPv6 | [system76](https://system76.com/time/) | Ohio |
| `oregon.time.system76.com` | Yes | IPv4 / IPv6 | [system76](https://system76.com/time/) |Oregon |

### Canada

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `time.nrc.ca` | No | IPv4 | [National Research Council Canada](https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/network-time-protocol-ntp) | |
| `time.chu.nrc.ca` | No | IPv4 | [National Research Council Canada](https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/network-time-protocol-ntp) | |

## South America

### Brazil

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| `a.st1.ntp.br` | Yes | IPv4 / IPv6 | [Brazilian Network Information Center](https://ntp.br/) | |
| `b.st1.ntp.br` | Yes | IPv4 | [Brazilian Network Information Center](https://ntp.br/) | |
| `c.st1.ntp.br` | Yes | IPv4 | [Brazilian Network Information Center](https://ntp.br/) | |
| `d.st1.ntp.br` | Yes | IPv4 | [Brazilian Network Information Center](https://ntp.br/) | |
| `a.ntp.br` | No | IPv4 / IPv6 | [Brazilian Network Information Center](https://ntp.br/) | |
| `b.ntp.br` | No | IPv4 / IPv6 | [Brazilian Network Information Center](https://ntp.br/) | |
| `c.ntp.br` | No | IPv4 / IPv6 | [Brazilian Network Information Center](https://ntp.br/) | |
| `gps.ntp.br` | Yes | IPv4 / IPv6 | [Brazilian Network Information Center](https://ntp.br/) | |
| `brazil.time.system76.com` | Yes | IPv4 / IPv6 | [system76](https://system76.com/time/) | |

## dn42

| Server | NTS | Connectivity | Organization | Note |
| --- | --- | --- | --- | --- |
| | | | |

## Yggdrasil

| Server | Organization | Note |
| --- | --- | --- |
| `ntp.yggnode.ygg` / `202:a2a5:dead:ded:9a54:4ab5:6aa7:1645` | [nikat](https://[302:a2a5:dead:ded::a2a5]/) |
| `200:8ce3:6def:9d4d:a976:9dfb:f0a6:91ce` | [Unkn0wnCat](https://kevink.dev/de/) | |

## leap smear note

leap smear distributes the leap second over the entire year and does not insert it abruptly and suddenly at one point in time. Most servers do not use leap smear. It is not recommended to use leap smear servers with non-leap smear servers. This is because both then think that the other is going wrong, although both are going right and are just using a different technique regarding leap seconds.
