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Port 143

Port
Protocol
Service Name
Description
Source
143
TCP UDP
imap
Internet Message Access Protocol
IANA
143
TCP 
Internet Message Access Protocol (IMAP)—management of email messages,Official
wikipedia
143
TCP 
Internet Message Access Protocol (IMAP), Mail (for receiving email)
Apple.com
143
 
ADM worm
simovits.com
143
TCP UDP
imap
Internet Message Access Protocol
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);