:551
(TCP/UDP)
Low Risk
Cybercash
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TCP/UDP — Other
Port Overview
Port Number
551
Service Name
Cybercash
Transport Protocol
TCP/UDP
Category
Other
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 551?
CyberCash. Protocol for the CyberCash internet payment system, an early e-commerce payment gateway.
TCP/UDP
Other
Security Considerations
Port 551 (Cybercash) 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.