Port 123

Port 123 is used for Network Time Protocol (NTP) which is used for synchronizing the clocks of computers over a network.

Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.

Official

Port
Protocol (TCP/UDP)
Title
Description
Port Type
Port 123
tcp
ntp
Network Time Protocol
WELL KNOWN PORT
Port 123
udp
ntp
Network Time Protocol
WELL KNOWN PORT

UnOfficial

Unofficialy or sometimes with conflict, the same port may be used by different applications.

Port Protocol (TCP/UDP) Description
TCP UDP Ports
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