Operata captures a parameter called networkType from within the WebRTC RTCIceCandidateStats, the networkType is one of the following values:
bluetooth - tethered to a BT connection
cellular - via 3G, 4G, 5G
ethernet - a wired local LAN
wifi - wireless LAN
wimax - WiMAX connection
vpn - the underlying network type is not available, and abstracted by the VPN virtual interface
unknown - unable or unwilling to identify the underlying connection technology
In some cases "unknown" is reported due to security/permission configuration at an OS level or group policy.
In some instances, the network type will show for some network interfaces (or IP subnets) but not others, for the same agent.
Your OS or security teams may provide specific policy details.