1812
RADIUS Authentication
Medium RiskUDP — Security & VPN
Port Overview
Port Number
1812
Service Name
RADIUS Authentication
Transport Protocol
UDP
Category
Security & VPN
Security Risk
Medium
Port Range
Registered (1024-49151)
What is Port 1812?
Port 1812 is the official IANA-assigned port for RADIUS (Remote Authentication Dial-In User Service) authentication. RADIUS provides centralized authentication, authorization, and accounting (AAA) for users connecting to a network. It is fundamental to Wi-Fi enterprise authentication (802.1X), VPN access, and network access control.
UDP
Security & VPN
Commonly Used
Security Considerations
Port 1812 (RADIUS Authentication) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.