The "Auth-Application-Id" AVP

The "Auth-Application-Id" Diameter AVP, which is of type AppId, uses the AVP code "258".

It has the MANDATORY flag.

It is part of the AA-Request, AA-Answer, Re-Auth-Request, Session-Termination-Request, Abort-Session-Request, Credit-Control-Request, Credit-Control-Answer, QoS-Authorization-Request, QoS-Authorization-Answer, QoS-Install-Request, QoS-Install-Answer, NAT-Control-Request, IKEv2-SK-Request, IKEv2-SK-Answer, User-Authorization-Request, User-Authorization-Answer, Server-Assignment-Request, Server-Assignment-Answer, Location-Info-Request, Location-Info-Answer, Multimedia-Auth-Request, Multimedia-Auth-Answer, Registration-Termination-Request, Registration-Termination-Answer, Push-Profile-Request, Push-Profile-Answer, Capabilities-Exchange-Request, Capabilities-Exchange-Answer, Capabilities-Update-Request, Diameter-EAP-Request, Diameter-EAP-Answer, MIP6-Request, MIP6-Answer, AA-Mobile-Node-Request, AA-Mobile-Node-Answer, Home-Agent-MIP-Request, Home-Agent-MIP-Answer, Trigger-Establishment-Request, 3GPP-Device-Action-Request, 3GPP-Device-Action-Answer, 3GPP-Device-Notification-Request, 3GPP-Device-Notification-Answer, Spending-Limit-Request, Spending-Limit-Answer, Spending-Status-Notification-Request, GCS-Action-Request, GCS-Action-Answer, GCS-Notification-Request, GCS-Notification-Answer, PX-Request, PX-Answer, XA-Request, XA-Answer commands.

It is part of the Vendor-Specific-Application-Id, Supported-Applications grouped AVPs.