563
NNTPS
Low RiskTCP — Messaging
Port Overview
Port Number
563
Service Name
NNTPS
Transport Protocol
TCP
Category
Messaging
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 563?
Port 563 is assigned to NNTPS (Network News Transfer Protocol over TLS), the encrypted version of NNTP for Usenet news. Usage has declined.
TCP
Messaging
Security Considerations
Port 563 (NNTPS) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.
Recommendation: Standard security practices apply. Keep software updated and monitor access.