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Port 81

Port
Protocol
Service Name
Description
Source
81
 
Unassigned
IANA
81
TCP 
Torpark—Onion routing,Unofficial
wikipedia
81
TCP 
RemoConChubo
anti-trojan
81
 
RemoConChubo
sans.org
81
 
Asylum
simovits.com
81
TCP 
Xeory
bekkoame
81
TCP 
RemoConChubo
bekkoame
81
TCP UDP
hosts2-ns
HOSTS2 Name Server
bekkoame
81
TCP 
W32.Beagle
bekkoame
81
 UDP
W32.Beagle
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);