Is Your VPN Leaking Your DNS or IP? Free Test + Fix (2026)
You pay $10 a month for a VPN so your internet provider, your government, and random Wi-Fi snoops can't see what you're doing online. But here's the uncomfortable truth: plenty of VPN users are still broadcasting their real IP address, their real DNS requests, or both — while their VPN app sits there showing a green "Connected" icon the whole time. The VPN isn't lying to you, exactly. It's just not doing its whole job.
Quick answer: To check if your VPN is leaking, connect to your VPN and visit a site like dnsleaktest.com or ipleak.net — if the IP address or ISP name shown matches your real internet provider instead of the VPN server's location, you have a leak. Pay special attention to IPv6 addresses, since many VPN apps only protect IPv4 traffic and silently let IPv6 slip through unencrypted.
What Is a DNS, IP, or WebRTC Leak — And Why It Defeats the Point of a VPN
A VPN is supposed to do two things at once: encrypt your traffic and route it through a tunnel so your real IP address is hidden, and handle your DNS lookups (the "translation" from a website name like example.com to an actual server address) inside that same tunnel. When either of those fails, you get a leak.
A DNS leak happens when your device ignores the VPN's DNS servers and sends lookups straight to your ISP's DNS servers instead. Your traffic might still be encrypted, but your ISP can see every domain you visit just by watching those DNS requests — which is often enough to reconstruct your entire browsing history.
An IP leak is worse: it means your real public IP address is visible to the websites you visit, not just the VPN server's IP. This can happen through IPv6 traffic bypassing the tunnel entirely, or through a dropped VPN connection that fails silently.
A WebRTC leak is a browser-specific issue. WebRTC is a feature Chrome, Firefox, and Edge use for video calls and peer-to-peer connections, and it can reveal your real IP address directly to a webpage's JavaScript — completely bypassing your VPN, because it operates at the browser level rather than the OS network level.
Any one of these quietly defeats the entire reason you're paying for a VPN in the first place.
How to Test for Leaks in Under 2 Minutes
You don't need any technical skill for this — just a browser and your VPN turned on.
Step 1: Check your real IP first
Disconnect your VPN and visit ipleak.net or search "what is my IP." Write down or screenshot your real IP address and your ISP's name (e.g., Comcast, Vodafone, Deutsche Telekom).
Step 2: Connect your VPN and re-test
Turn your VPN on, choose a server, then reload ipleak.net or head to dnsleaktest.com and run the "Extended Test." You should now see a completely different IP address, and the location and ISP listed should match your VPN provider's server — not your home ISP.
Step 3: Scroll down and check IPv6 and DNS servers specifically
This is the step almost everyone skips. On ipleak.net, look for a separate IPv6 address field. If it shows an address at all — and especially if it matches your real ISP — your VPN isn't handling IPv6 and you have a leak. On the DNS leak test results, every DNS server listed should belong to your VPN provider (or a privacy-focused resolver they route through), not your ISP.
Step 4: Test WebRTC separately
Browser fingerprinting sites like browserleaks.com/webrtc will show you the IP your browser is exposing via WebRTC specifically. If it shows your real IP while your VPN is connected, that's a browser-level leak, not a VPN app problem.
💡 Run the test on a killed connection too
Leaks often happen for a split second when your Wi-Fi drops or your VPN reconnects after sleep — not just while it's stably connected. After your normal test, try disabling Wi-Fi briefly and re-enabling it while the VPN app is running, then immediately refresh dnsleaktest.com. A properly working kill switch should block all internet access until the VPN tunnel is back up, rather than letting a few unprotected requests through.
The Most Common Causes of VPN Leaks
If your test above showed a leak, it's almost always one of these four culprits:
Poor IPv6 handling. Many VPN apps were built to tunnel IPv4 traffic only. If your home network or ISP has IPv6 enabled (increasingly common), that traffic can travel outside the encrypted tunnel entirely, exposing your real IP even though IPv4 looks fine.
A buggy or absent kill switch. A kill switch is supposed to cut your entire internet connection if the VPN tunnel drops, so nothing leaks out unprotected. Cheap or poorly coded VPN apps implement this inconsistently across operating systems, and it often fails specifically during reconnects, sleep/wake cycles, or network switches.
Browser WebRTC settings. Since WebRTC operates independently of your OS-level VPN tunnel, it's a leak vector no VPN app can fully control from the outside — it has to be handled by the browser or a browser extension.
Split tunneling misconfiguration. Split tunneling lets you route some apps through the VPN and others outside it — useful for local network access or banking apps, but if you accidentally include your main browser in the "outside the VPN" list, every site you visit leaks your real IP by design, not by bug.
How to Fix a Leaking VPN
Once you know the cause, the fixes are straightforward:
Enable and verify your kill switch. It's usually off by default. Turn it on in your VPN app's settings, then re-run the "kill the connection" test from the callout above to confirm it actually blocks traffic rather than just displaying a warning.
Disable IPv6 if your VPN doesn't fully support it. You can turn off IPv6 at the OS network adapter level (Windows, macOS, and most routers all support this), which forces all traffic through IPv4 and into the tunnel where your VPN can actually protect it.
Double-check split tunneling rules. If you're not actively using split tunneling for a specific reason, turn it off entirely so nothing accidentally bypasses the tunnel.
Disable WebRTC in your browser, or use your VPN's browser extension. Firefox lets you disable WebRTC in about:config; Chrome requires an extension. Many VPN providers now ship browser extensions specifically designed to block WebRTC leaks alongside the desktop app.
Or — switch to a provider that's engineered around this problem. If you're finding leaks repeatedly no matter what you tweak, the underlying app is the issue, not your settings. This is really where provider choice matters most. Proton VPN has the strongest privacy reputation in the industry, with fully open-source apps that undergo public, independent audits — meaning leak-prevention code (including IPv6 and kill switch handling) is scrutinized by outside researchers, not just marketing claims. NordVPN is another strong pick here: it runs its own DNS servers on every single node it operates (rated 4.9/5 overall), which directly closes off the most common DNS leak vector, and its no-logs claims have been independently audited.
FAQ
Can a VPN leak my IP even if it says "Connected"?
Yes. The "Connected" status only confirms the tunnel is technically up — it doesn't guarantee every type of traffic (like IPv6 or WebRTC) is actually routed through it. That's exactly why a separate leak test is necessary even when your app looks fine.
Is a DNS leak as serious as an IP leak?
It's different but still serious. A DNS leak exposes which websites you visit to your ISP even though your traffic content stays encrypted, while an IP leak exposes your actual location and identity to the sites themselves. Neither should be ignored.
How often should I test my VPN for leaks?
Test right after installing a new VPN, after any major app or OS update, and periodically (monthly is reasonable) if you rely on your VPN for sensitive activity — leaks can be introduced silently by software updates on either end.
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