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Port 43

Port
Protocol
Service Name
Description
Source
43
TCP UDP
nicname
Who Is
IANA
43
TCP 
WHOIS protocol,Official
wikipedia
43
TCP UDP
nicname
Who Is
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);