648
RRP
Low RiskTCP — Other
Port Overview
Port Number
648
Service Name
RRP
Transport Protocol
TCP
Category
Other
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 648?
Registry Registrar Protocol (RRP), defined in RFC 2832, was the original protocol for domain registrar-to-registry communication. Largely replaced by EPP on port 700.
TCP
Other
Security Considerations
Port 648 (RRP) 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.