Network Time Protocol service

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NTP is designed to be highly fault-tolerant. For this purpose it is best for a machine to be obtain time from a number of different servers.

IT Services provide four time servers, available to any Oxford IPv4 host. These are located at four separate locations and obtain their time using a combination of external sources and GPS signals.

Where possible, please use the following four DNS names:,,,

In ntp.conf format this would be

server    # IT Services NTP server
server    # IT Services NTP server
server    # IT Services NTP server
server    # IT Services NTP server

A DNS round robin of exists for the above if your device will only accept one entry.

If the configuration of your device will not accept a DNS name, the IPv4 addresses are:

Please note that the IP addresses of NTP servers may occasionally be subject to change, although IT Services will endeavour to minimise the frequency of such changes. Notice will be given to the itss-announce mailing list.

NTP is defined in RFC 1305, Network Time Protocol (version 3)

If you wish to use an external source in addition, we suggest using

The NTP service was once more complex with separate stratums and an enforced hierarchy. There are a large number of devices in the university using the older service addresses and so to this end the older DNS names and addresses are maintained for the time being to reduce workload on IT staff university-wide.

The following additional addresses are currently supported but should not be entered in new configuration: has address has address has address has address

A DNS round robin of exists for the historical stratum 3 service.

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