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Port 57

Port
Protocol
Service Name
Description
Source
57
TCP UDP
any private terminal access
IANA
57
TCP 
Mail Transfer Protocol (RFC 780),Official
wikipedia
57
TCP UDP
any private terminal access
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);