Is port 89 (SU/MIT Telnet Gateway) dangerous?

Port 89 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 89 be open on my firewall?

Port 89 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 89 use?

Port 89 (SU/MIT Telnet Gateway) uses the TCP transport protocol and falls under the Remote Access category.

:89 (TCP)

SU/MIT Telnet Gateway

Low 风险

TCP — Remote Access

端口概览

端口号 89

服务名称 SU/MIT Telnet Gateway

传输协议 TCP

类别 Remote Access

安全风险 Low

端口范围知名端口 (0-1023)

什么是端口 89?

Port 89 was assigned to the SU/MIT Telnet Gateway, an early ARPANET service that provided mediated Telnet access through a gateway system at MIT and Stanford.

TCP Remote Access

安全注意事项

端口89（SU/MIT Telnet Gateway）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。

SU/MIT Telnet Gateway

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端口概览

什么是端口 89?

安全注意事项

相关端口 — Remote Access

相关术语