Should port 72 be open on my firewall?

Port 72 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 72 use?

Port 72 (NETRJS-2) uses the TCP/UDP transport protocol and falls under the System & Infrastructure category.

:72 (TCP/UDP)

NETRJS-2

Q: Is port 72 (NETRJS-2) dangerous?

Port 72 is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose with standard security practices.

Low Risk

TCP/UDP — System & Infrastructure

Port Overview

Port Number 72

Service Name NETRJS-2

Transport Protocol TCP/UDP

Category System & Infrastructure

Security Risk Low

Port Range Well-Known (0-1023)

What is Port 72?

NETRJS-2 is the second of four ports (71-74) assigned to the ARPANET Remote Job Entry service for submitting batch workloads to remote mainframes. Defined in RFC 740 and used in the early ARPANET environment of the 1970s. It is completely obsolete.

TCP/UDP System & Infrastructure

Security Considerations

Port 72 (NETRJS-2) 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.

Related Ports — System & Infrastructure

0 Reserved 1 TCPMUX 2 Management Utility 3 CompressNET 4 Unassigned 5 RJE 6 Unassigned 7 Echo

Related Terms

Bandwidth Latency Packet Loss Ping Throughput ASN