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Port 18

Port
Protocol
Service Name
Description
Source
18
TCP UDP
msp
Message Send Protocol (historic)
IANA
18
TCP UDP
Message Send Protocol,Official
wikipedia
18
 
Skun
simovits.com
18
TCP UDP
msp
Message Send Protocol
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);