Should port 1813 be open on my firewall?

Port 1813 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 1813 use?

Port 1813 (RADIUS Accounting) uses the UDP transport protocol and falls under the Security & VPN category.

:1813 (UDP)

RADIUS Accounting

Q: Is port 1813 (RADIUS Accounting) dangerous?

Port 1813 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

UDP — Security & VPN

Port Overview

Port Number 1813

Service Name RADIUS Accounting

Transport Protocol UDP

Category Security & VPN

Security Risk Low

Port Range Registered (1024-49151)

What is Port 1813?

Port 1813 is the official IANA-assigned port for RADIUS accounting. It collects session data including start/stop times, bytes transferred, and user identity for billing and auditing purposes. Network access servers send accounting records to the RADIUS server on this port.

UDP Security & VPN Commonly Used

Security Considerations

Port 1813 (RADIUS Accounting) 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 — Security & VPN

31 MSG-AUTH 48 Auditd 49 TACACS 56 XNS-AUTH 62 ACA Services 65 TACACS-DS 88 Kerberos 90 DNSIX Security

Related Terms

SSL/TLS Certificate DDoS DNS Spoofing Encryption Firewall HTTPS