Is port 73 (NETRJS-3) dangerous?

Port 73 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.

Should port 73 be open on my firewall?

Port 73 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 73 use?

Port 73 (NETRJS-3) uses the TCP/UDP transport protocol and falls under the System & Infrastructure category.

:73 (TCP/UDP)

NETRJS-3

Low 风险

TCP/UDP — System & Infrastructure

端口概览

端口号 73

服务名称 NETRJS-3

传输协议 TCP/UDP

类别 System & Infrastructure

安全风险 Low

端口范围知名端口 (0-1023)

什么是端口 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

安全注意事项

端口73（NETRJS-3）被归类为低风险。该服务使用加密或攻击面极小，相对安全可以暴露。

建议：应用标准安全实践。保持软件更新并监控访问。

NETRJS-3

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端口概览

什么是端口 73?

安全注意事项

相关端口 — System & Infrastructure

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