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Port 172

Port
Protocol
Service Name
Description
Source
172
TCP UDP
cl-1
Network Innovations CL/1 IANA assigned this well-formed service name as a replacement for "cl/1".
IANA
172
TCP UDP
cl/1
Network Innovations CL/1
IANA
172
TCP UDP
cl/1
Network Innovations CL/1
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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);