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New free tool: WebRTC leak test

A new free tool shows whether WebRTC hands websites your real IP address while you use a VPN or proxy, and whether your local network address is visible.

By New feature Updated

What changed

We added a WebRTC leak test to our free tools. WebRTC is the part of your browser that makes video calls and direct connections work, and any web page can ask it for your addresses without asking you. The test puts the addresses WebRTC shares next to the IP address our site sees, and tells you in one line whether anything leaks.

What it means for you

  • Check that your VPN covers WebRTC. If we see a VPN, proxy or hosting address but WebRTC shows a different public address, that one is probably your real IP, and the test says so.
  • IPv4 and IPv6 are both checked. A VPN that hides one IP version can leak the other; the test warns when WebRTC finds an address in the version your connection is not using.
  • Your local address too. Current browsers hide your device’s address on your home or office network behind a random name. The test tells you if yours does not.

How to use it

Open the WebRTC leak test with your VPN on. It runs by itself, usually within a few seconds. The check happens in your browser: the only outside request goes to Cloudflare’s public STUN server, which answers with the public address it sees, and nothing WebRTC finds is sent to us. To see what the rest of the internet learns about your connection, try the VPN and proxy detector.

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