Is port 1646 (RADIUS Accounting (old)) dangerous?

Port 1646 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 1646 be open on my firewall?

Port 1646 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 1646 use?

Port 1646 (RADIUS Accounting (old)) uses the UDP transport protocol and falls under the Security & VPN category.

:1646 (UDP)

RADIUS Accounting (old)

Low 风险

UDP — Security & VPN

端口概览

端口号 1646

服务名称 RADIUS Accounting (old)

传输协议 UDP

类别 Security & VPN

安全风险 Low

端口范围已注册 (1024-49151)

什么是端口 1646?

Port 1646 is the legacy RADIUS accounting port, used before IANA standardized port 1813 for RADIUS accounting. It records network access session information such as duration, bytes transferred, and user identity. Many older RADIUS servers and network devices still support this port.

UDP Security & VPN

安全注意事项

端口1646（RADIUS Accounting (old)）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。

RADIUS Accounting (old)

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端口概览

什么是端口 1646?

安全注意事项

相关端口 — Security & VPN

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