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Port 42

Port
Protocol
Service Name
Description
Source
42
TCP UDP
name
Host Name Server
IANA
42
TCP UDP
nameserver
Host Name Server
IANA
42
TCP UDP
ARPA Host Name Server Protocol,Official
wikipedia
42
TCP UDP
Windows Internet Name Service,Unofficial
wikipedia
42
TCP 
W32.Dasher
bekkoame
42
TCP UDP
name
Host Name Server
bekkoame
42
TCP UDP
nameserver
Host Name Server
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);