[Nerada]

IKWYD is impressive. Not the results. I'm behind CGNAT and it's claiming my IP is static when it's dynamic so I know none of these files, but the fact that it was able to get my local IP at all when I'm behind both a corporate VPN and being routed through a CASB (with SSL interception enabled and working) is impressive. I wonder how it's done that. Maybe something DNS-based?

First time I've seen my local IP in one of these, genuinely impressed.

[jfim]

I believe they use WebRTC for that, eg: https://browserleaks.com/webrtc

[Nerada]

Interestingly, RTCPeerConnection and RTCDataChannel come up as "True", but the IP address fields come up as "n/a".