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 84
Ports those registered with IANA are shown as official ports. The same port number
Port 1417
Ports those registered with IANA are shown as official ports. The same port number
Port 44553
Ports those registered with IANA are shown as official ports. The same port number
Port 2812
Port 2812 is typically used for monitoring and managing the performance of open-source software
Ports 4200 – 4300
Port 4200- Port 4300 Port 4300- Port 4400 Port 4400- Port 4500 Port 4500-
Port 4403
Ports those registered with IANA are shown as official ports. The same port number
Port 4114
Ports those registered with IANA are shown as official ports. The same port number
Port 5151
Port 5151 is commonly used for multiple purposes, including: 1. Oracle database communication: Port
Port 5235
Ports those registered with IANA are shown as official ports. The same port number
Port 8021
Port 8021 is used for FTP control traffic over SSL/TLS. It is often used
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