688
REALM-RUSD
Low RiskTCP/UDP — Other
Port Overview
Port Number
688
Service Name
REALM-RUSD
Transport Protocol
TCP/UDP
Category
Other
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 688?
REALM-RUSD (Realm Roaming User Session Database) protocol, used in early mobile network roaming session management systems. No significant modern deployment.
TCP/UDP
Other
Security Considerations
Port 688 (REALM-RUSD) 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.