:101
(TCP)
Low Risk
NIC Host Name
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TCP — DNS
Port Overview
Port Number
101
Service Name
NIC Host Name
Transport Protocol
TCP
Category
DNS
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 101?
Port 101 was the original ARPANET host name server, providing hostname-to-address lookups via the Network Information Center (NIC) before DNS was invented.
TCP
DNS
Security Considerations
Port 101 (NIC Host Name) 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.