What should I do if a WebRTC leak test tool can’t detect my public IP?

When you use a WebRTC leak test tool to check your network, you may hit a situation where pages load just fine and a standard public IP lookup returns normal results, yet the WebRTC test page never shows a public IP.

That doesn't necessarily mean something is broken — and it's not proof that your network has no IP leaks, either.

A regular public IP lookup and a WebRTC leak test work in fundamentally different ways. Browser settings, the state of your network connection, the address-gathering process, and the test page's own compatibility can all affect the final result.

1. Why Can't the WebRTC Leak Test Detect a Public IP?

WebRTC is a real-time communication technology built into browsers, commonly used for video calls, voice chat, and peer-to-peer data transfer. When establishing a connection, the browser uses the ICE (Interactive Connectivity Establishment) mechanism to gather network candidates so it can find a suitable communication path. WebRTC leak test tools inspect those candidates to see whether they contain any IP addresses worth worrying about.

Normally, the candidate list may include several types of addresses — but that doesn't mean every test will surface a public IP. A browser may handle certain addresses differently for privacy reasons, and the current network can also affect how candidates are gathered. On top of that, if the test page's JavaScript doesn't run properly, the tool may be unable to display the full results.

There's another easily overlooked factor: test tools are built in different ways, so how they obtain, parse, and display candidate addresses can vary. So if one tool doesn't show a public IP, that doesn't mean another tool won't detect it — and it's certainly not enough to judge whether your network is safe.

The public IP looks fine, but WebRTC shows nothing. How do you troubleshoot?

🔶 Start by opening a standard public IP lookup page to confirm that an external server can identify your network's outbound address. If the regular IP lookup also fails to show a result, check your network connection, web access, and DNS resolution first.

🔶 Next, compare results across mainstream browsers such as Chrome, Edge, or Firefox. Use reasonably up-to-date versions and keep your network environment unchanged. If one browser shows candidate addresses and another doesn't, the problem may be tied to that browser's WebRTC implementation, privacy settings, or extensions.

🔶 If you have ad blockers, privacy tools, or network management extensions installed, it's worth temporarily ruling out whether they're interfering with the test page. You can compare using an incognito window — but keep in mind that incognito mode doesn't necessarily disable all extensions.

🔶 Your browser's WebRTC-related settings are also worth a look. If you previously changed address exposure or privacy options, try restoring them to a configuration you understand, then see whether the results change. These settings work differently across browsers, and it's not advisable to turn off privacy protections just to make a public IP appear, or to tweak low-level parameters you're not familiar with.

🔶 If the page keeps loading, or still shows nothing after repeated refreshes, consider that the tool itself may be the issue. Switch to another trusted WebRTC leak test page, check whether the page's resources have finished loading, and look for JavaScript errors in the browser console.

2. What to Focus on for Different Test Results

When a WebRTC leak test tool fails to detect a public IP, you can use the standard public IP lookup together with the address types shown on the page to decide what to check next. The situations below are common, but they only offer clues — they can't pinpoint the exact cause on their own.

If the test page shows an IPv4 address in the 192.168.x.x or 10.x.x.x range, or anywhere from 172.16.x.x to 172.31.x.x, those are typically private addresses that can't be routed directly on the public internet. Browsers may also use mechanisms such as mDNS to handle local address information, so a page that doesn't directly display a LAN IP doesn't necessarily mean the test failed.

When you're evaluating the results, don't focus only on whether an IP address appears. Also weigh the address type, the standard public IP lookup result, and the tool's own documentation. In particular, when the page shows only a LAN address, you shouldn't assume the public IP is unusable, nor conclude from that single item that no IP leak exists.

3. What to Keep in Mind When Using ToDetect to Check IP Information

If you want to dig deeper into your network's public outbound address and related network details, you can run an IP check with ToDetect (todetect.cn) and compare the results against your WebRTC leak test. First confirm that the IP lookup page correctly shows the public address, then see whether the WebRTC test tool can gather candidate information. This helps narrow down where the problem lies.

Keep in mind that a standard IP check and a WebRTC leak test aren't looking at the same thing. A regular IP lookup is typically done by an external server identifying the source address from your request, whereas a WebRTC test mainly examines the network candidates gathered during the browser's real-time communication process. A normal result on the former doesn't guarantee the latter will show a public IP; and a WebRTC test that doesn't show a public IP doesn't, by itself, prove there are no leaks.

If the two results don't match, you can cross-check by switching browsers or test tools, and keep troubleshooting based on your browser settings and network environment. When using online test tools, choose trustworthy websites, avoid installing extensions from unknown sources, and never submit personal information that has nothing to do with the test.

4. WebRTC Leak Detection: Frequently Asked Questions

The WebRTC leak test doesn't show a public IP — is that a network problem?

Not necessarily. If pages load normally and the standard public IP lookup works, the issue may lie with the browser's WebRTC settings, the candidate gathering process, or the test page itself. Try a different browser first, then compare using another test tool.

WebRTC only shows a LAN IP — is that normal?

Possibly. The browser may have gathered only LAN candidates, or it may have handled local address information through mechanisms like mDNS. Base your judgment on the standard public IP lookup and other test results, rather than assuming something is wrong just because you see a LAN address.

Why do different WebRTC leak test tools show different results?

Tools can differ in their testing workflow, page scripts, and how they parse candidate addresses. Even with the same browser and network environment, results can vary. When they don't match, keep the test conditions the same and cross-check with another trusted tool.

Summary

If a WebRTC leak test tool can't detect a public IP, the first step is to confirm whether the standard public IP lookup works. If neither shows a result, check your network connection and page loading first.

When troubleshooting, change only one variable at a time: start with the standard public IP check, then compare across browsers, and finally combine the results from tools like ToDetect before drawing a conclusion.

This makes it easier to pinpoint the problem — and keeps you from changing network settings unnecessarily or reaching the wrong conclusion just because a single test page didn't show a public IP.