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Port 45

Port
Protocol
Service Name
Description
Source
45
TCP UDP
mpm
Message Processing Module [recv]
IANA
45
TCP UDP
mpm
Message Processing Module [recv]
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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);