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Port 22

Port
Protocol
Service Name
Description
Source
22
TCP UDP
ssh
The Secure Shell (SSH) Protocol
IANA
22
SCTP 
ssh
SSH
IANA
22
TCP UDP
Secure Shell (SSH) — used for secure logins, file transfers (scp, sftp) and port forwarding,Official
wikipedia
22
TCP 
Secure Shell (SSH), Xcode Server (hosted and remote Git+SSH; remote SVN+SSH)
Apple.com
22
TCP 
Shaft
anti-trojan
22
 
Shaft
sans.org
22
 
InCommand, Shaft, Skun
simovits.com
22
TCP UDP
ssh
SSH Remote Login Protocol
bekkoame
22
 UDP
pcAnywhere(Used in older versions, though newer version still use it for backwards compatibility.)
bekkoame
22
TCP 
Shaft
bekkoame

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A port is an application-specific or process-specific software construct serving as a communications endpoint in a computer's host operating system.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);