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Port 13

Port
Protocol
Service Name
Description
Source
13
TCP UDP
daytime
Daytime
IANA
13
TCP UDP
Daytime Protocol (RFC 867),Official
wikipedia
13
TCP UDP
daytime
Daytime (RFC 867)
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);