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Port 90

Port
Protocol
Service Name
Description
Source
90
TCP UDP
dnsix
DNSIX Securit Attribute Token Map
IANA
90
TCP UDP
dnsix (DoD Network Security for Information Exchange) Securit Attribute Token Map,Official
wikipedia
90
TCP UDP
PointCast (dotcom),Unofficial
wikipedia
90
TCP UDP
dnsix
DNSIX Securit Attribute Token Map
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);