Port 123

Modified by:

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
Other ports
Port 10161
Ports those registered with IANA are shown as official ports. The same port number
Port 75
Port 75 is not officially assigned to any specific service or application. However, it
Port 2934
Ports those registered with IANA are shown as official ports. The same port number
Port 8003
Port 8003 is not commonly associated with a specific use or application. It is
Port 1205
Ports those registered with IANA are shown as official ports. The same port number
Port 2433
Ports those registered with IANA are shown as official ports. The same port number
Port 6509
Port 6509 is commonly used for communication between network devices, particularly for Cisco switches
Port 17234
Ports those registered with IANA are shown as official ports. The same port number
Ports 8600 – 8700
Port 8600- Port 8700 Port 8700- Port 8800 Port 8800- Port 8900 Port 8900-
Ports 53800 – 53900
Port 53800- Port 53900 Port 53900- Port 54000 Port 54000- Port 54100 Port 54100-
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