3868
Diameter Protocol
Medium RiskTCP/UDP — Security & VPN
Port Overview
Port Number
3868
Service Name
Diameter Protocol
Transport Protocol
TCP/UDP
Category
Security & VPN
Security Risk
Medium
Port Range
Registered (1024-49151)
What is Port 3868?
Port 3868 is the standard port for the Diameter protocol, the successor to RADIUS used for authentication, authorization, and accounting (AAA) in telecommunications and 4G/LTE networks. Mobile network operators use Diameter for authentication of subscribers and policy control. It is a core protocol in the 3GPP standards for LTE/EPC network architecture.
TCP/UDP
Security & VPN
Security Considerations
Port 3868 (Diameter Protocol) 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.