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Port 50

Port
Protocol
Service Name
Description
Source
50
TCP UDP
re-mail-ck
Remote Mail Checking Protocol
IANA
50
TCP UDP
Remote Mail Checking Protocol,Official
wikipedia
50
TCP 
DRAT
emsisoft
50
TCP 
D.R.A.T
anti-trojan
50
 
DRAT
sans.org
50
TCP 
DRAT
bekkoame
50
TCP UDP
re-mail-ck
Remote Mail Checking 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);