22 SSH / SCP / SFTPSecure Shell: encrypted remote login, file transfer (scp, sftp) and port forwarding.
The default remote-admin port on Linux/Unix; also widely used for tunneling. Restrict to management networks.
| Transport | Status | Meaning |
|---|---|---|
| TCP | Yes | Assigned by IANA and standardized, specified, or widely used on this port. |
| UDP | Assigned | Assigned by IANA, but not standardized, specified, or widely used on this port. |
| SCTP | Yes | Assigned by IANA and standardized, specified, or widely used on this port. |
| DCCP | — | Not applicable for this transport. |
Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.
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