* Please note: While we show the geographical locations of our servers, they are all available for use nationally.

Our service uses rate limiting, if you have over ten LAN clients that require time synchronisation, we would recommend using a local time server infrastructure to serve those LAN clients and ensure a consistent service.

Our current infrastructure recommendation is to run a minimum of two network time servers.  Configuring each to use three of our servers, two common and one different, this provides a balance of consistency and resilience.

e.g.

timeserver 1 - ntp0.ja.net, ntp1.ja.net, ntp3.ja.net

timeserver 2 - ntp0.ja.net, ntp1.ja.net, ntp4.ja.net

Network time upgrade:

15th – 16th September: Server NTP1 will be upgraded on these dates. A multi-hour outage of NTP1 is expected during the upgrade.

The other Janet NTP servers will be unaffected.

Service updates

Planned maintenance on ntp0.ja.net and ntp2.ja.net

Please note that from time to time the National Physical Laboratory carries out scheduled maintenance on their MSF transmission equipment which will affect the Janet NTP servers ntp0.ja.net and ntp2.ja.net. Any known maintenance dates are provided below. There shouldn't be any interruptions to the service, but the servers ntp0 and ntp2 will be running at stratum-2 instead of stratum-1 during these maintenance periods.  For more information, please refer to the National Physical Laboratory website: http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-outages. The remaining Janet NTP servers should be available as normal unless other maintenance work is being carried out.