:55
(TCP/UDP)
Low Risk
ISI-GL
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TCP/UDP — System & Infrastructure
Port Overview
Port Number
55
Service Name
ISI-GL
Transport Protocol
TCP/UDP
Category
System & Infrastructure
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 55?
ISI Graphics Language. A protocol from the Information Sciences Institute (ISI) for transmitting graphical data over the network.
TCP/UDP
System & Infrastructure
Security Considerations
Port 55 (ISI-GL) 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.