:481
(TCP/UDP)
Low Risk
PH
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TCP/UDP — Other
Port Overview
Port Number
481
Service Name
PH
Transport Protocol
TCP/UDP
Category
Other
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 481?
PH (Phone Book) Service. CCSO Nameserver/PH directory service for looking up people and contact information, commonly used at universities.
TCP/UDP
Other
Security Considerations
Port 481 (PH) 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.