pool.ntp.org


pool.ntp.org: public ntp time server for everyone

Introduction

Active Servers

As of 2019-08-26

The pool.ntp.org project is a big virtual cluster of timeservers providing reliable easy to use NTP service for millions of clients.

The pool is being used by hundreds of millions of systems around the world. It's the default "time server" for most of the major Linux distributions and many networked appliances (see information for vendors).

Because of the large number of users we are in need of more servers. If you have a server with a static IP address always available on the internet, please consider adding it to the system.

The project is maintained and developed by Ask Bjørn Hansen and a great group of contributors on the mailing lists. The source code for the system is available.

Hosting and bandwidth for the "hub" servers are provided by Packet and NetActuate.

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News

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  • April 5, 2019

    GPS rollover

    As you might have seen in the news or from the US CERT, there’s an internal counter in the GPS messages that will “rollover” this week.

    Poorly implemented GPS receivers might lose track of time because of this.

    Many servers in the NTP Pool are using GPS signals to set the time, either directly or indirectly from another server that listens for GPS signals.

    The expected impact on users of the NTP Pool is very little or none at all. The NTP Pool monitoring system will detect any systems that are wildly off and have them removed from DNS responses within typically 10-20 minutes.

    Most servers would also recognize that the “jump” in time from a potentially misbehaving GPS clock is too large and ignore it (the time would be set back to August 1999, most likely).

    Most importantly, reasonably well written clients will poll 3 or 4 IPs and ignore the one that’s an outlier by decades, recognize that the time returned is many years older than the earliest possible manufacturing date of itself or that the jump in time is too large and again ignore it.

    The time of the rollover is midnight UTC on April 7 (so late afternoon April 6th in California or the morning of April 7 in Asia). We will be checking the NTP Pool monitoring data for any signs of problems through the day.

    See also the NTP Pool community discussion.

  • May 21, 2017

    How to Configure NTP for Use in the NTP Pool Project

    Daniel Ziegenberg wrote a tutorial for Digital Ocean on configuring NTP for the NTP Pool on Ubuntu.

    Oliver Nadler has another tutorial covering non-Ubuntu, too.

  • January 1, 2017

    NTP Pool Forum

    There’s a new forum for discussion related to the NTP Pool at community.ntppool.org. Please come join us. There are a couple interesting threads about the recent leap second and lots of empty space for your questions or suggestions. :-)

    The NTP Pool mailing lists are generously hosted on lists.ntp.org on the Network Time Foundation infrastructure. Those servers moved this summer and it’s been a bit of “rough seas” since. Over the summer hundreds of people got unsubscribed because mail deliveries were failing and the lists were bouncing all mails for a while in the second half of December.

    We’ll keep having the mailing list, too. In particular for people new to the project having us build out the new forum will be better (search, better access to archives, getting more mail in your email inbox is optional, etc).

    Happy new year!

  • December 19, 2016

    Excessive load on NTP servers

    Since last Tuesday some countries have seen an excessive number of queries to the NTP Pool.

    After much detective work on nanog (conclusion) and the #NTP IRC channel it was determined to be a buggy Snapchat app update.

    Hopefully the Snapchat developers will fix it soon (and sign up for a vendor zone!).

    (Yes, the first link is to a new forum).

  • November 29, 2016

    Equipment failure

    A network switch failed causing an outage for the management system and the NTP Pool website. The DNS and NTP services should only be minorly affected, even if the outage lasts a little while.

    I’ll update status website with updates.

  • Older news...

Links

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Status | Comments and questions to Ask Bjørn Hansenask@develooper.com