:421
(TCP/UDP)
Ariel2
Low RiskTCP/UDP — Other
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Port Overview
Port Number
421
Service Name
Ariel2
Transport Protocol
TCP/UDP
Category
Other
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 421?
Ariel2. Extended protocol for the Ariel interlibrary document delivery system.
TCP/UDP
Other
Security Considerations
Port 421 (Ariel2) 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.