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Port 109

Port
Protocol
Service Name
Description
Source
109
TCP UDP
pop2
Post Office Protocol - Version 2
IANA
109
TCP 
Post Office Protocol v2 (POP2),Official
wikipedia
109
 
ADM worm
simovits.com
109
TCP UDP
pop2
Post Office Protocol - Version 2
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);