Port 57 is not an officially assigned port by the Internet Assigned Numbers Authority (IANA) and therefore, it does not have a standard or official use. It could potentially be used for a custom or proprietary application or service by individual organizations or software developers.
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 57 | tcp | any private terminal | WELL KNOWN PORT | |
Port 57 | udp | any private terminal | WELL KNOWN PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
Port | Protocol (TCP/UDP) | Description |
Port 57 | Mail Transfer Protocol (MTP) |