What to Do If a WebRTC Leak Test Shows Your Public IP: Causes, Diagnosis, and Fix Guide

Open a WebRTC leak test page and the public IP field shows an address, sometimes even flagged in red. Does that mean your real IP has already leaked?

Not necessarily. Seeing a public IP through WebRTC does not mean your network privacy is compromised. What matters is whether the address matches the actual egress of your current network, and whether the browser exposed network information it was not supposed to reveal.

1. Why does WebRTC detection show a public IP?

WebRTC is the browser technology behind real-time audio and video, commonly used for web conferencing, live chat support, and voice calls.

When a connection is set up, the browser gathers available network addresses through the ICE mechanism. A STUN server helps the browser discover its externally visible public address and generates the matching connection candidates.

Those candidates usually fall into three types:

•  host: a candidate address bound to a local network interface.

•  srflx: an external mapped address discovered through a STUN server.

•  relay: an address used when traffic is relayed through a TURN server.

A WebRTC leak test analyzes the candidate information the browser is willing to hand out. So a public IP on the results page may simply be the normal outcome of an active connection.

2. When should a public IP in WebRTC get your attention?

When reading the results, start by separating three cases.

Case one: the public IP matches your current network egress.

If the device connects to the internet directly and the WebRTC public IP is identical to what a regular IP check returns, that is usually normal. It does not mean the browser exposed some additional network path.

Case two: an unexpected public address shows up.

For example, the device is going through a corporate network path, yet the WebRTC results include a public IP that is not part of the expected egress. That calls for a closer look at how the connection is set up and which interfaces the browser is selecting.

Keep in mind that dual-stack networks, multi-NIC devices, or enterprise split-tunnel configurations can also produce different addresses. An IP mismatch on its own is not proof that a leak occurred.

Case three: the results include a private IP.

If addresses such as 192.168.x.x or 10.x.x.x appear, some local network information may have been readable by the page.

Modern browsers generally rely on mDNS to mask local addresses, but how well that works depends on browser version and configuration. If the results keep showing a private IP, it is worth investigating further.

3. How do you run a WebRTC leak test?

There is no need to start changing browser settings. First, pin down the current state of your network.

Step one: record your current public IP.

Open a public IP check page and note the full IPv4 or IPv6 address. If the device uses both protocols, check them separately so nothing is missed.

Step two: run the WebRTC leak test.

Open ToDetect's WebRTC detection feature and look for public IPs, local addresses, and the different types of ICE candidate information.

The key question: do the addresses WebRTC reports belong to the egress your network is supposed to be using?

Step three: cross-check the results.

Run the test with a second WebRTC tool. Different tools use different STUN servers and detection methods, so the results will not necessarily match exactly.

If something looks off, retest while keeping the connection stable, and record how the addresses change.

4. How do you fix an abnormal WebRTC result?

If the leak test turns up an unexpected public IP or a private address, work through the checks below in order. Settings differ across browsers and operating systems, so retest after each change.

Tip: check the browser and network interfaces first. There is no need to disable WebRTC simply because a public IP showed up. If unexpected addresses persist after adjustments, run ToDetect again and use the ICE candidate types to narrow down the cause.

5. Why check DNS and browser fingerprint at the same time?

WebRTC covers only part of network environment testing. A DNS check shows which servers handle your domain resolution requests, while browser fingerprinting reveals environment details such as browser version, language, and timezone.

ToDetect offers WebRTC leak detection, public IP checks, DNS checks, and browser fingerprint features, so you can compare results across different tests and see whether anything looks off in the network environment.

Compared with looking at a single public IP address, cross-checking several data points makes configuration changes easier to spot, and gives you a baseline to re-check after a browser update or a network switch.

6. WebRTC leak test FAQ

Q: Is the public IP shown by WebRTC always the real IP?

Not necessarily. It may be the external mapped address of your current network, or the egress of a different interface. Judge it against the actual connection environment.

Q: Should I disable WebRTC if it shows a public IP?

No. A public IP on a direct connection is perfectly normal. Disabling WebRTC outright can break web conferencing, voice calls, and similar features.

Q: Do mobile browsers need testing too?

Yes, when needed. Android and iOS browsers differ in how they support WebRTC and handle network information, so re-check after switching between Wi-Fi and mobile data.

Q: How often should I run the test?

There is no fixed schedule. Testing after changing devices, switching networks, or updating the browser tends to be more informative, and saving results periodically gives you a baseline for comparison.

Summary

A public IP in a WebRTC leak test does not mean your privacy has leaked. What actually deserves attention is whether the browser exposed a network address it should not have.

When something looks wrong, confirm your public egress first, then review the ICE candidate information, and finally check browser and system network settings. Running periodic checks in ToDetect and comparing results over time gives you a clearer picture of your network environment and surfaces changes worth a closer look.