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WebRTC Exposure Test

WebRTC can expose local or public ICE candidates. This test reports what the browser actually gathers; a public STUN address alone does not prove VPN bypass.

This test contacts the STUN server stun.cloudflare.com to discover ICE candidates.

No LAN address observed in this run

Tip: run again with your VPN on/off to compare results.

What is WebRTC?

WebRTC (Web Real-Time Communication) is a technology that enables peer-to-peer communication directly between browsers. While this is great for video calls and file sharing, it can also be exploited to discover your real IP address.

How WebRTC Works

  • • Discovers local network interfaces
  • • Uses STUN servers to find public IP
  • • Creates ICE candidates for connection
  • • Bypasses proxy/VPN in some cases

Privacy Risks

  • • Reveals local IP addresses
  • • Can expose public IP behind VPN
  • • Works without user permission
  • • Difficult to detect without tools

How to Protect Yourself

Browser Settings

  • • Disable WebRTC in browser settings
  • • Use WebRTC blocking extensions
  • • Enable strict privacy modes
  • • Use browsers with WebRTC controls

Browser Extensions

  • • WebRTC Leak Prevent
  • • uBlock Origin (advanced settings)
  • • Privacy Badger
  • • Browser-specific WebRTC blockers

Advanced Methods

  • • Use Tor Browser
  • • VPN with WebRTC protection
  • • Firewall rules blocking STUN
  • • Virtual machines for isolation

Browser-Specific Protection

Firefox

Type about:config in address bar, then set:

media.peerconnection.enabled = false

Chrome

Install WebRTC Network Limiter extension or use command line flag:

--force-webrtc-ip-handling-policy=disable_non_proxied_udp

Safari

Go to Preferences → Privacy → Website tracking → Prevent cross-site tracking

Important Note

Disabling WebRTC will break video calling websites like Google Meet, Zoom web client, and other WebRTC-based applications. Consider using dedicated apps for video calls or temporarily re-enabling WebRTC when needed.

Related reading

WebRTC leaks explained: how your real IP can slip past a VPN

WebRTC helps video calls work in your browser, but its connection setup can expose your real IP address even when a VPN is on. Here is what actually leaks, how to check, and how to stop it.

Read article

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