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Port 158

Port
Protocol
Service Name
Description
Source
158
TCP UDP
pcmail-srv
PCMail Server
IANA
158
TCP UDP
DMSP, Distributed Mail Service Protocol,Unofficial
wikipedia
158
TCP UDP
pcmail-srv
PCMail Server
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);