What you're seeing
If a local IP appears above (something like 192.168.x.x or a long fe80:: address), your browser is exposing your device's address on its own network through WebRTC. On its own that's low-risk. The real concern is when your public WebRTC address differs from the IP your VPN shows — that means sites can see around your VPN to your true address.
How to stop the leak
The cleanest fix is at the browser: disable WebRTC where you don't need it, or install an extension that blocks WebRTC IP handling. A VPN with built-in WebRTC leak protection closes it too. If you rely on video calls, don't disable it globally — use a per-site approach instead so calls keep working.
Frequently asked questions
Is a WebRTC leak dangerous?
Why does this show an address even without a VPN?
Does disabling WebRTC break anything?
Runs client-side. No server needed — the probe uses your browser's own WebRTC stack. FAQ ships as FAQPage schema; page carries SoftwareApplication + BreadcrumbList.