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Port 53

Port
Protocol
Service Name
Description
Source
53
TCP UDP
domain
Domain Name Server
IANA
53
TCP UDP
Domain Name System (DNS),Official
wikipedia
53
TCP UDP
Domain Name System (DNS), MacDNS, FaceTime
Apple.com
53
TCP 
Bonk (DoS)
emsisoft
53
 
ADM worm, li0n, MscanWorm, MuSka52
simovits.com
53
TCP 
W32.Spybot
bekkoame
53
TCP UDP
domain
Domain Name Server
bekkoame
53
TCP 
W32.Dasher
bekkoame
53
TCP 
Esteems
bekkoame
53
TCP 
Civcat
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);