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Feature overview
Charles
2026-10-20 10:50When you're using a fingerprint browser, does a normal-looking IP on a web page mean WebRTC isn't leaking anything? Not necessarily.
A fingerprint browser can adjust the User-Agent, time zone, language, Canvas and other browser characteristics, but none of those settings decide which network addresses WebRTC ends up exposing.
If WebRTC isn't configured properly, the IP a site sees and the IP a WebRTC test returns may not match. So once you've set up your browser environment, it's worth running a dedicated WebRTC leak test rather than relying on a plain IP lookup.
1. Why Do WebRTC Leaks Happen?
WebRTC is the technology browsers use for real-time audio and video — video conferencing, in-browser voice calls and similar features all run on it.
To establish a connection, WebRTC uses the ICE mechanism to gather every network address it can use. That list may include local network addresses, the public address it learns from a STUN server, and relay server addresses.
The problem is that WebRTC doesn't necessarily take the same network path as an ordinary page request. If the browser is free to use other routes, a test page can end up seeing an address that differs from the IP your browsing traffic is using.
That said, a mismatch doesn't automatically mean your real IP has leaked. You also need to look at the type of address involved and how your network is actually configured.
2. Why Can't a Fingerprint Browser Fix WebRTC Leaks on Its Own?
A fingerprint browser mainly manages browser environment characteristics: screen resolution, fonts, WebGL, language, time zone and the like.
WebRTC is about network connections and address gathering, which is a different layer entirely. Some fingerprint browsers do offer separate WebRTC settings, usually along these lines:
• Leave it at the default: the browser keeps its native WebRTC behavior, which may collect multiple network addresses.
• Disable WebRTC: this restricts the feature, but it can break things like in-browser video meetings and voice calls.
• Limit address exposure: depending on what the browser supports, fewer unexpected network addresses will show up.
• Use a specified address: some browsers let you change the candidates presented to the page, but that doesn't guarantee the actual connection uses that address.
The setting names and implementations vary from product to product, so no single option tells you whether you're safe. You still have to look at the test results.
3. How Do WebRTC Test Results Differ Across Three Browser Setups?
To keep things simple, common test outcomes can be grouped into three cases. These are illustrative scenarios, not actual test records.
Case 1: plain Chrome
When the browser connects directly, the IP a site sees and the public address WebRTC collects may well be the same. If local address protection is enabled, the test page may only display obfuscated hostnames instead.
Case 2: a fingerprint browser with default WebRTC settings
The browsing IP shows the intended network exit, but the WebRTC test page may surface other public addresses or LAN addresses.
What matters here is whether any unexpected public IP appears — not simply seeing several addresses and declaring a leak.
Case 3: adjusting the WebRTC address exposure policy
Where the browser supports it, keeping unintended network interfaces out of address gathering can make previously visible addresses disappear from the test page.
Fewer results doesn't mean every network issue is solved, though. Confirm that the related calling and conferencing features still work properly.
Together, these three cases show that WebRTC results depend not just on the browser you're using, but also on its specific settings and the network environment.
4. How to Check Whether WebRTC Is Leaking Your Real IP
You can work through it with the WebRTC leak test that ToDetect provides.
| Step | What to do | What to look for |
|---|---|---|
| 1. Check your current IP | Open ToDetect and look at the IP your browsing traffic is using | Note the public IP address and its location |
| 2. Run the WebRTC test | Run the WebRTC leak test and look at the candidate addresses it returns | Whether any public IP shows up that you didn't expect |
| 3. Compare the results | Match the WebRTC addresses against your browsing IP | Whether they agree, and whether any difference fits your current network setup |
| 4. Check local addresses | Look for addresses such as 192.168.x.x or 10.x.x.x | Whether local network details are being exposed |
| 5. Test DNS | Use the DNS leak test to check your resolution results | Whether the DNS servers match your current network configuration |
| 6. Adjust and retest | Review your WebRTC settings, change them, then run the test again | Whether the unexpected addresses are gone and in-browser communication still works |
5. Things People Overlook When Running a WebRTC Leak Test
Is turning WebRTC off always the better option?
Not always. Disabling it entirely can break web features that depend on WebRTC. If you need video meetings or voice calls, you're better off tuning the address exposure policy to what your browser supports and then verifying those features still work.
Does incognito mode fix it?
No. Incognito mainly stops local browsing data from being kept around; it doesn't change how WebRTC handles network connections.
Is passing the test once enough?
Not really. Browser updates, switching networks and changes to system configuration can all affect how WebRTC actually behaves.
Do mobile browsers need testing too?
They do. When a phone switches between Wi-Fi and cellular, the network interfaces and connection paths change, and WebRTC results can change along with them.
Wrapping Up
A fingerprint browser can manage a wide range of environment parameters, but it can't guarantee that WebRTC won't expose network addresses you didn't intend to share.
The way to judge whether a leak exists is to compare your browsing IP against the addresses WebRTC collects, then read that alongside the candidate address types, your browser settings and the network you're actually on.
It's worth running a WebRTC leak test with ToDetect whenever you first set up a browser, switch networks, or finish a major version update — and pairing it with an IP lookup and a DNS test to confirm your network information looks the way it should.