WebRTC can reveal your real IP address even behind a proxy or VPN. This test asks your browser for the IPs WebRTC would expose to a website — entirely in your browser, nothing leaves your device.
WebRTC is a browser feature for real-time audio/video. To connect peers it can query STUN servers and expose your device's IP addresses — including your real public IP — to any site running WebRTC, bypassing an HTTP/SOCKS proxy that only routes normal web traffic. If this test shows a public IP that matches your real location while you're on a proxy, you have a leak. Fixes: disable WebRTC (or use an extension that does), route all traffic through a system-level VPN/SOCKS tunnel rather than a browser proxy, or use an antidetect browser. Then confirm your exit IP with What Is My IP.
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