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Port 199

Port
Protocol
Service Name
Description
Source
199
TCP UDP
smux
SMUX
IANA
199
TCP UDP
SMUX, SNMP Unix Multiplexer,Official
wikipedia
199
TCP UDP
smux
SMUX
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);