The Network Time Protocol (NTP) is a protocol for distributing the Coordinated Universal Time (UTC) by synchronizing the clocks of computer systems over IP networks.
NTP is one of the oldest Internet Protocols still in use (since before 1985) and uses UDP port 123.
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NTP was designed by David L. Mills.
The NTP management protocol utility ntpq being used to query the state of a stratum 2 server.