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Note that a local IP address is blacked out on the left. You can see that my public IPv6 address (beginning with 2) is leaking in the WebRTC area, even while the VPN is connected and stable.

Below is an example of WebRTC leaks that I found when testing out a VPN service. If you see your ISP-assigned (external) IP address, then this is a WebRTC leak.

– In addition to WebRTC leaks, this website also tests for IPv4, IPv6, and DNS leaks.

Our guide on testing your VPN lists a few different WebRTC testing tools: While the WebRTC feature may be useful for some users, it poses a threat to those using a VPN and seeking to maintain their online privacy without their IP address being exposed. If you have not protected yourself against WebRTC leaks in your browser, any website you visit could obtain your real (ISP-assigned) IP address through WebRTC STUN requests. This leak can de-anonymize you via WebRTC APIs, even if your VPN is working correctly. What is a WebRTC leak?Ī WebRTC leak is when your external (public) IP address is exposed via your browser’s WebRTC functionality.

This basically allows for voice, video chat, and P2P sharing within the browser (real-time communication) without adding extra browser extensions. WebRTC stands for “Web Real-Time Communication”. WebRTC leaks can affect these browsers: Chrome, Firefox, Safari, Opera, Brave, and Chromium-based browsers. While the WebRTC issue is often discussed with VPN services, this is, in fact, a vulnerability with web browsers. When discussing online privacy and VPNs, the topic of WebRTC leaks and vulnerabilities frequently comes up.