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Port 3

Port
Protocol
Service Name
Description
Source
3
TCP UDP
compressnet
Compression Process
IANA
3
TCP UDP
CompressNET Compression Process,Official
wikipedia
3
TCP UDP
compressnet
Compression Process
bekkoame
3
TCP UDP
compressnet
Midnight Commander Sometimes this program is assigned to this port
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);