Free VPN Leak Test: IP, DNS & WebRTC
Is Your VPN Actually Working?
Most VPN leak tests only check your IP. We test 3 attack vectors.
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Detecting your IP address...
IP Address
IPv6 Address
Location
Network Provider
DNS Leak Test
WebRTC Leak Test
Technical Details
What this test cannot detect
- Whether your VPN provider logs traffic
- Leaks from apps outside your browser
- VPN speed or server performance
- Malware or tracking in your VPN app
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This tool tests your VPN connection for three types of leaks: IP address leaks, DNS leaks, and WebRTC leaks. We built it because most VPN leak tests only check your IP. Ours runs all three checks simultaneously and gives you a verdict in under 30 seconds.
Since launching this tool in 2018, we’ve logged 27,869 tests from users in over 40 countries. Here’s what we’ve found: only about a third of tests come back completely clean. Another third show warnings, and the remaining third reveal confirmed leaks. The most common leak type, by a wide margin, is WebRTC – accounting for roughly 70% of all leaks we detect. Most users had no idea their browser was exposing their real IP address through a channel their VPN doesn’t even touch.
We also see a significant gap between desktop and mobile: 41% of mobile tests reveal leaks, compared to 23.5% on desktop. Android users fare worst at 40.7% failure. If you only test your VPN on your laptop, you might be getting a false sense of security.
IP Leak Test: Check for IP Address Leaks
Your IP address reveals your approximate location, your internet service provider, and a unique identifier that websites and advertisers use to track you. When you connect to a VPN, your traffic should appear to come from the VPN server‘s IP address, not your own.
An IP leak means your VPN is failing at its most basic job. In our test data, IP leaks are actually the least common leak type – most modern VPNs handle basic IP masking well. The bigger problems are DNS and WebRTC, which many VPN apps don’t fully protect against.
IPv6 leaks deserve special attention. Many VPN providers still don’t route IPv6 traffic through their tunnel. They either block it (better) or let it pass through unprotected (worse). If your ISP assigns you an IPv6 address and your VPN only tunnels IPv4, the IPv6 traffic leaks silently.
How to Fix an IP Leak
- Enable the kill switch in your VPN app. This blocks all internet traffic if the VPN connection drops, preventing your real IP from being exposed even momentarily. In our experience, a disabled kill switch is the single most common cause of IP leaks.
- Disable IPv6 in your operating system’s network settings if your VPN doesn’t support it. On Windows: Network adapter properties, uncheck Internet Protocol Version 6. On macOS: System Settings, Network, Advanced, TCP/IP, set Configure IPv6 to Off.
- Switch VPN protocols. WireGuard and OpenVPN handle IP routing more reliably than older protocols like PPTP or L2TP.
- If the leak persists after these steps, your provider may have a fundamental configuration problem. Consider switching to a VPN that has passed an independent security audit.
DNS Leak Test: What It Is and How to Fix It
DNS (Domain Name System) translates website names into IP addresses. Every time you visit a website, your device sends a DNS query to resolve that site’s address. Without a VPN, these queries go to your ISP’s DNS servers, giving your ISP a complete log of every website you visit – even if you’re using HTTPS.
A DNS leak means those queries are still going to your ISP or a third-party DNS provider, even though the rest of your traffic is encrypted through your VPN. This is one of the most common VPN failures, and it’s invisible unless you test for it specifically.
The DNS section of the test above shows you exactly which DNS servers are handling your requests. If you see your ISP’s name or a server in your physical location while connected to a VPN, you have a DNS leak. We classify a DNS leak when we detect your ISP’s resolver handling queries instead of your VPN’s DNS server – we check this using unique subdomains that can only be resolved by specific servers.
One thing worth noting: DNS leaks often appear alongside IP leaks. In our data, when someone has a DNS leak, they frequently have other leaks too – it’s a sign that the VPN tunnel itself may not be properly configured.
How to Fix a DNS Leak
- Use your VPN’s built-in DNS. Most reputable providers operate their own DNS servers. Check that “DNS leak protection” or “Use VPN DNS” is enabled in your app settings. This is the most reliable fix.
- Set a secure third-party DNS manually. If your VPN doesn’t offer its own DNS, configure your system to use a privacy-focused provider like Cloudflare (
1.1.1.1) or Quad9 (9.9.9.9) instead of your ISP‘s default. - Enable DNS-over-HTTPS (DoH). This encrypts DNS queries themselves, adding a second layer of protection even if your VPN tunnel fails. Firefox, Chrome, and Edge all support DoH in their network settings.
- Check your split tunneling rules. If your VPN routes only certain apps through the tunnel, DNS requests from excluded apps will leak directly to your ISP.
WebRTC Leak Test
WebRTC (Web Real-Time Communication) is a browser technology that powers video calls, voice chat, and peer-to-peer file sharing. It’s built into Chrome, Firefox, Edge, Safari, and Opera. The problem: WebRTC can reveal your real IP address to any website that requests it, even when you’re connected to a VPN.
This happens because WebRTC uses a protocol called STUN that queries your network interfaces directly, bypassing the VPN tunnel entirely. A website running a few lines of JavaScript can silently discover both your public and local IP addresses – no permission prompt, no notification.
WebRTC is the biggest leak problem we see. It accounts for roughly 70% of all leaks detected by this tool. Chrome users are the most affected, with a 33.7% failure rate compared to 25.8% for Firefox. This makes sense – Firefox gives users a simple toggle to disable WebRTC entirely, while Chrome requires a browser extension.
The WebRTC section of the test above shows whether your real IP is visible through this channel. If the IP listed under WebRTC matches your actual address (not your VPN server), you have a WebRTC leak.
How to Fix a WebRTC Leak
- Firefox: Type
about:configin the address bar, search formedia.peerconnection.enabled, and set it tofalse. This disables WebRTC entirely. It’s a one-minute fix and it’s why Firefox users have the lowest WebRTC leak rate in our data. - Chrome and Edge: These browsers don’t offer a built-in toggle. Install a browser extension like WebRTC Leak Prevent or WebRTC Control from the Chrome Web Store.
- Safari: Go to Settings, Advanced, and enable “Show Develop menu in menu bar.” Then open the Develop menu, select Experimental Features, and uncheck WebRTC.
- Best long-term fix: Use a VPN provider whose app or browser extension includes built-in WebRTC leak protection, so you don’t have to manage browser settings manually.
How to Test Your VPN Connection
Follow this method to verify your VPN’s security in under two minutes:
- Disconnect your VPN and run the test at the top of this page. Note the IP address, DNS servers, and WebRTC results shown. This is your unprotected baseline.
- Connect your VPN to your preferred server location and run the test again.
- Compare the two results. A properly working VPN should show:
- A different IP address that matches your chosen VPN server location
- DNS servers operated by your VPN provider, not your ISP
- No WebRTC IP address that matches your real location
- If any result matches your unprotected baseline, you have a leak. Scroll up to the relevant section above for specific fix instructions.
Re-run this test after updating your VPN app, changing servers, or installing OS updates. VPN configurations can break silently, and the only way to know is to test. We recommend testing at least once a month.
Common Reasons a VPN Test Fails
If your test reveals leaks, here are the most likely causes based on what we see in our data – and what to do about each one.
- Kill switch is disabled. Without a kill switch, any brief VPN disconnection silently exposes your real IP address. This is the single most common cause of IP leaks. Enable it in your VPN app settings – it should be on by default, but many providers ship with it off.
- Split tunneling is misconfigured. If certain apps or sites are set to bypass the VPN, DNS and IP requests from those apps will leak to your ISP. Review your split tunneling rules carefully.
- Your VPN doesn’t support IPv6. If your ISP assigns you an IPv6 address and your VPN only tunnels IPv4 traffic, the IPv6 traffic leaks unprotected. Disable IPv6 on your device or switch to a VPN that handles both.
- You’re using an outdated protocol. PPTP and L2TP have known security weaknesses. Switch to WireGuard or OpenVPN for more reliable leak protection.
- You’re on mobile. Our data shows mobile users fail at nearly twice the rate of desktop users (41% vs 23.5%). Mobile VPN apps often have weaker leak protection, and mobile operating systems handle VPN connections differently. Always test on mobile separately.
- Your ISP or country blocks VPN traffic. Some networks use deep packet inspection to detect and disrupt VPN connections. Try a protocol with obfuscation (often labeled “stealth mode” or “camouflage” in VPN apps).
- The VPN app has a bug. Try updating your app, switching servers, or restarting the connection before assuming the provider itself is unreliable.
- The provider itself is the problem. Some VPN services – particularly free ones – don’t properly configure their servers, run their own DNS, or protect against WebRTC leaks. If basic fixes don’t resolve your leaks, it may be time to compare VPN providers that have passed independent audits.
What We’ve Learned from 27,869 VPN Tests
We’ve been running this tool since 2018, and a few patterns keep showing up:
WebRTC is the leak most VPN providers ignore. Roughly 70% of all leaks we detect are WebRTC leaks. Most VPN apps focus on IP and DNS protection but leave WebRTC completely unprotected. The fix is simple (disable WebRTC or use a VPN with built-in protection), but most users don’t know they need to.
Mobile is the weak link. 41% of mobile tests show leaks, compared to 23.5% on desktop. Android is the worst at 40.7%. If you’re only testing your VPN on your computer, you’re missing the platform most likely to fail.
Chrome users leak more than Firefox users. Chrome has a 33.7% overall failure rate versus Firefox’s 25.8%. The main reason: Firefox has a built-in WebRTC kill switch (about:config > media.peerconnection.enabled > false). Chrome doesn’t.
Leaks cluster together. When a VPN leaks, it often leaks in more than one way. A combined IP and DNS leak usually signals a fundamental tunnel failure, not just a configuration issue.
You can explore all of our test data – broken down by country, browser, device, and leak type – on our VPN Test Index. Every stat on this page comes from that dataset.
VPNs We’ve Put Through Our Leak Test
We don’t just build testing tools – we use them. These are five VPNs we’ve reviewed in depth using the same methodology behind the test above. What you see below is real data from our testing, not marketing copy. We track things most review sites don’t bother with: post-quantum encryption readiness, whether a no-logs claim has survived a court challenge, and whether servers run on RAM (so data can’t persist after reboot).
ExpressVPN
NordVPN
Surfshark
ProtonVPN
CyberGhost
Based on hands-on testing. How we test · ExpressVPN is a featured partner
Compare VPNs by What Matters to You
Different users need different things. We’ve built detailed comparison guides for the most common use cases, each backed by hands-on testing and the data from 27,869 leak tests.
Frequently Asked Questions
Is my VPN working right now?
Run the test at the top of this page with your VPN connected. If the IP address matches your VPN server’s location (not your physical location) and no DNS or WebRTC leaks are detected, your VPN is working. If any result shows your real IP or your ISP’s name, you have a leak – see the fix guides above.
What is a VPN leak test?
A VPN leak test checks whether your VPN is actually protecting you or silently failing. It tests three channels: your IP address (is your real location hidden?), your DNS queries (is your ISP logging the sites you visit?), and WebRTC (is your browser bypassing the VPN?). Most people assume their VPN is working because they’re connected – but connection and protection are not the same thing. In our data, roughly two-thirds of tests show at least a warning or confirmed leak.
What is a DNS leak and why does it matter?
A DNS leak happens when your browser’s website lookups bypass your VPN and go directly to your ISP’s servers. Even if your IP address is hidden, a DNS leak gives your ISP a complete record of every website you visit. It’s one of the most common VPN failures and completely invisible without a dedicated test.
How often should I test my VPN?
Test after installing or updating your VPN app, after switching servers, and at least once a month. VPN apps can break silently after operating system updates, and server configurations can change without warning. We also recommend testing on every device you use – our data shows significant differences between desktop and mobile results.
Can my ISP see that I’m using a VPN?
Your ISP can see that you’re connected to a VPN server, but not what you’re doing through it – assuming your DNS isn’t leaking. If you have a DNS leak, your ISP can see every website you visit even though your other traffic is encrypted. That’s why running a DNS leak test matters even when your IP appears hidden.
Why does my VPN leak on some devices but not others?
VPN apps are configured differently across platforms. A Windows app might include DNS leak protection and a kill switch that the mobile version lacks. WebRTC behavior also varies by browser – in our data, Chrome users fail at a higher rate (33.7%) than Firefox users (25.8%). Test on each device and browser you use regularly.
Do free VPNs leak more than paid ones?
In our testing across dozens of VPN providers, free VPNs are significantly more likely to leak DNS and lack basic security features like a kill switch or IPv6 protection. That said, “paid” alone doesn’t guarantee security – some paid providers also fail leak tests. The test above works the same regardless of which VPN you use.
What’s the difference between a DNS leak test and a VPN test?
A VPN test covers IP address masking, DNS routing, and WebRTC exposure all at once. A DNS leak test specifically checks whether your domain name lookups are going through your VPN’s DNS servers or leaking to your ISP. Our tool runs all three tests simultaneously, so you get a complete picture in one check.
Is my VPN leaking?
If you run the test above and see your real IP address, your ISP’s DNS servers, or a WebRTC result matching your physical location, then yes – your VPN is leaking. The test labels each result clearly so you can identify the specific leak type and fix it using the guides on this page.
Ready to check your VPN? The test tool is at the top of this page – it takes less than 30 seconds.
This tool is free and requires no account. We log anonymous test verdicts (pass/warn/fail, browser, and device type) to build the aggregate statistics cited on this page – no IP addresses are stored. VPN Testing is an independent review site – we are not a VPN provider. Learn how we test.
Update history
This page was revised 50 times between April 2021 and March 2026.
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