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Port 201

Port
Protocol
Service Name
Description
Source
201
TCP UDP
at-rtmp
AppleTalk Routing Maintenance
IANA
201
TCP UDP
AppleTalkĀ Routing Maintenance,Official
wikipedia
201
 
One Windows Trojan
simovits.com
201
TCP UDP
at-rtmp
AppleTalk Routing Maintenance
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);