Port 23

Port 23 is used for Telnet, which is a protocol commonly used to provide remote access to a computer over a network. It allows a user to log in to a remote system and execute commands as if sitting directly at the console. However, Telnet is considered a security risk as the communication is not encrypted and can be intercepted, so it is recommended to use a more secure protocol such as SSH (Secure Shell) instead.

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 23
tcp
telnet
Telnet
WELL KNOWN PORT
Port 23
udp
telnet
Telnet
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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