WebRTC Leak test

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    What is WebRTC?

    WebRTC, or Web Real-Time Communication, is a technology that enables real-time communication with Javascript APIs in your browser, without additional software. As an open-source framework, which is promoted by Mozilla and Google, among others, WebRTC functions as a secure communication infrastructure for video chats, voice calls or file sharing via web apps. WebRTC, when combined with the web conferencing server and the STUN server, provides the starting page and ensures the synchronisation of the connection between the endpoints.

    To connect to each other, computers use the so called “IP Addresses”. The public IP of each device is unique in the world. So you can exactly be identified by your public IP. So it is also possible to monitor you and your activities.
    WebRTC is a relatively new technology that allows two computers to communicate directly with each other without the need for an intermediate server. This allows data to be transmitted more quickly and so, for example, streams or downloads run faster. Unfortunately, this technique also carries certain dangers, because even if you use a VPN, it can reveal your public IP address.

    We developed this WebRTC leak test to tell you quick and easy if your browser has such a problem. However, it is very likely that you will have these problems without proper precautions, as all current browsers use WebRTC by default.

    To check if you have a WebRTC leak, just follow these steps:

    • End your VPN connection and open this page in a new tab or window
    • Make a screenshot or note all displayed public IP addresses
    • Close the window
    • Connect to a VPN server of your choice and reopen this page
    • If you now see addresses that were already present in the second step, there is a DNS leak! Time to act!

    In a blog post, we explained in detail how to successfully protect yourself from a DNS leak. You can find it here:How to disable WebRTC and be anonoymous on the Internet