NTP (Network Time Protocol)

INRIM provides a synchronization service for informatics system connected to the Internet, based on three primary NTP (Network Time Protocol) servers. The technical specifications of this synchronization protocol are described in the RCF-5905 document.

The time offset between the NTP servers reference time and the Italian national time scale UTC(IT) is continuously monitored and is kept below the level of one millisecond.

The synchronization precision depends on the informatics network topology and on the distance between the NTP servers and the PC/server to be synchronized. Normally a synchronization at the level of hundreds of microseconds for devices belonging to the NTP servers network can be achieved, while for remote networks some tens of millisecond could be achieved.

The INRIM NTP servers can be reached by means of the following addresses:





Indirizzo IP

Servizi disponibili


NTP (RCF-5905)


NTP (RCF-5905)


NTP (RCF-5905), TIME (RFC-868),

Last modified: 10/04/2017 - 15:37