73
NETRJS-3
Low RiskTCP/UDP — System & Infrastructure
Port Overview
Port Number
73
Service Name
NETRJS-3
Transport Protocol
TCP/UDP
Category
System & Infrastructure
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 73?
NETRJS-3 is the third variant port for the ARPANET Network Remote Job Service. Defined alongside ports 71, 72, and 74 in RFC 740, these ports represent the earliest form of remote computing over a network.
TCP/UDP
System & Infrastructure
Security Considerations
Port 73 (NETRJS-3) 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.