How WebRTC detection works

Principle of WebRTC operation

  • The site sends a regular TCP request from the browser (or anti-detect browser).

  • The anti-fraud system responds and injects a script for a STUN request.

  • The browser makes a STUN request over UDP, bypassing the proxy from the real address, since we remember that a proxy or anti-detect browser may not support UDP.

  • If the IPs of the TCP connection and the UDP differ, the user is exposed for using a proxy.

    Image and information kindly taken from the article ZloyTeam
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