You can set up a perfect mobile proxy, align the timezone and language — and still expose your real IP through a single leak channel. Its name is WebRTC. This browser technology can bypass the proxy and reveal your real address, nullifying all your masking. In this article we break down how a WebRTC leak works, how to run a WebRTC leak test, and how to close the leak so the proxy actually protects you.

What WebRTC is and why it leaks

WebRTC (Web Real-Time Communication) is a browser-built technology for direct device-to-device communication: video calls, voice, data exchange without intermediaries. To establish a direct connection, WebRTC must learn your real IP addresses.

The ICE and STUN mechanism

To establish a connection, WebRTC uses the ICE procedure and queries STUN servers. STUN answers the question "what is my external IP" — and does it bypassing the HTTP proxy, directly. As a result, the browser can learn and transmit your real public address even if all other traffic goes through the proxy.

Which addresses WebRTC can reveal

  • Real public IP — the main threat: it exposes you bypassing the proxy.
  • Local IPs — your network's internal addresses (for example, 192.168.x.x).
  • Proxy IP — if everything is set up correctly, only this is visible.

Why a WebRTC leak is dangerous

If you use mobile proxies from turbon.rent on physical SIMs in 17 countries, but WebRTC reveals the real public IP, the most dangerous thing happens — a mismatch.

  • Profile linking — several accounts with different proxies but one real IP from WebRTC get linked together.
  • A clear anomaly — the main traffic is from one country while WebRTC shows another: a signal of proxy use.
  • Deanonymization — the real address becomes visible to a party that shouldn't see it.

How to run a WebRTC leak test

Step 1. Turn on the proxy

Activate the mobile proxy in your browser or antidetect profile, just as for ordinary work.

Step 2. Open a leak test service

Go to any public WebRTC leak test service. It will try to determine your IP addresses via WebRTC the same way a site would.

Step 3. Compare the addresses

  • The WebRTC block should show only the proxy IP — of the same country and carrier.
  • If your real public IP is visible — that's a leak, and it needs to be closed.
  • Local addresses (192.168.x.x) are less critical on their own, but it's better to hide them too.

Step 4. Check DNS as well

In parallel, run a DNS leak test: resolution must go through the proxy channel, not through your real provider. A DNS leak is a related problem and also exposes the network context.

How to close a WebRTC leak

Disable or restrict WebRTC

The most reliable path is to fully disable WebRTC where it isn't needed, or restrict it so it doesn't reveal the real IP. In an antidetect environment this is usually done at the profile level.

Use an antidetect browser with WebRTC control

A quality antidetect browser lets you substitute the WebRTC IP with the proxy address, so both real communication and the fingerprint are consistent. The key — after setup, always recheck with a leak test.

Route all traffic into a tunnel

If all device traffic goes through a proxy tunnel (not just an HTTP proxy in the browser), WebRTC has fewer chances to go out directly. But even then a leak test check is mandatory.

Common mistakes

Assuming the proxy closes WebRTC itself

An HTTP proxy doesn't control WebRTC — it reaches STUN directly. Closing the leak is done separately, at the browser or tunnel level.

Checking once and forgetting

A browser update or profile reset can bring the leak back. Recheck after changes to the environment.

Ignoring DNS

You closed WebRTC but forgot about DNS — the network context is still exposed. These two checks go as a pair.

Frequently asked questions

Why doesn't the proxy hide WebRTC automatically?

Because WebRTC reaches STUN servers directly, bypassing the HTTP proxy, to learn the real IP for a direct connection. The leak must be closed separately — at the browser or tunnel level.

Are local IPs in the test results dangerous?

On their own, local addresses (192.168.x.x) are less critical than an exposed real public IP, but it's better to hide them too so as not to give extra data about the device.

How often should I run a WebRTC leak test?

After every proxy setup, browser update or profile change. A leak can return unnoticed, so the check should be regular.

Bottom line: WebRTC is the most insidious leak channel, able to reveal the real IP even with a perfectly configured proxy. Run a WebRTC leak test after every setup, close the leak at the browser or tunnel level, and don't forget about DNS. Build your proxy-plus-protection stack on mobile proxies from turbon.rent with API rotation, and for registering accounts on clean numbers use OTP activations from turbon.rent.