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Port 33

Port
Protocol
Service Name
Description
Source
33
TCP UDP
dsp
Display Support Protocol
IANA
33
TCP UDP
Display Support Protocol,Official
wikipedia
33
TCP UDP
dsp
Display Support 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);