DNS & WebRTC Leak Test

Check if your VPN is leaking your real IP address through DNS or WebRTC. Instantly detect DNS server mismatches, WebRTC local IP exposure, and other privacy leaks.

Click 'Run Leak Test' to check for DNS and WebRTC leaks

How to Check for VPN Leaks

  1. 1

    Connect to your VPN

    First, make sure your VPN is active and connected to your preferred server. This test is most useful when you want to verify your VPN is working properly.
  2. 2

    Run the leak test

    Click 'Run Leak Test' to start. The tool will check your public IP, query multiple DNS providers, and test for WebRTC IP exposure. This takes about 5 seconds.
  3. 3

    Review the results

    Check each section: your public IP should match your VPN server, DNS servers should belong to your VPN provider, and WebRTC should not expose local IPs.
  4. 4

    Fix any leaks found

    If DNS leaks are detected, configure your VPN to use its own DNS servers. For WebRTC leaks, disable WebRTC in your browser or install a WebRTC blocking extension.

Common Use Cases

1

VPN Verification

Confirm your VPN is properly routing all traffic including DNS queries. Many VPN providers claim full protection but leak DNS requests to your ISP.
2

Privacy Auditing

Regular privacy checks to ensure your browsing activity is not being exposed through DNS or WebRTC side channels.
3

Network Troubleshooting

Identify which DNS servers your network is using and verify they match your expected configuration.
4

Browser Security Testing

Test whether your browser's privacy settings are effectively preventing WebRTC from leaking local network information.

Why test for DNS and WebRTC leaks?

Even when you use a VPN, your browser can leak your real identity through two common channels: DNS queries and WebRTC connections. A DNS leak sends your website lookups to your ISP's DNS servers instead of your VPN's, revealing which sites you visit. A WebRTC leak exposes your local network IP address directly to websites. Both can compromise your privacy even with an active VPN connection.

DNS and WebRTC leak tests are essential tools for anyone using a VPN for privacy. Even premium VPN services can fail to route all your traffic through their encrypted tunnel, leaving DNS queries exposed to your Internet Service Provider. This tool checks for the two most common VPN leak vectors: DNS leaks (where your website lookups bypass the VPN) and WebRTC leaks (where your browser reveals local IP addresses directly to websites).

The test works by querying multiple DNS-over-HTTPS providers to identify which DNS resolvers your device is using, then checking your browser's WebRTC configuration for exposed local IP addresses. All testing happens client-side in your browser with no data stored on our servers. For a complete network security audit, combine this with our IP Address Lookup and DNS Security Scanner tools.

How It Compares

Most DNS leak test sites rely on custom DNS infrastructure that takes several seconds to complete and only checks DNS. FindUtils DNS Leak Test checks both DNS and WebRTC leaks instantly, runs entirely in your browser for maximum privacy, and provides actionable fix recommendations for each leak type detected. Unlike sites that only show raw IP addresses, we identify DNS providers by name and clearly indicate whether each detected server matches your VPN configuration.

Tips for Preventing Leaks

1
Always enable the kill switch feature in your VPN client to prevent traffic from bypassing the VPN tunnel.
2
Use your VPN provider's DNS servers rather than third-party DNS like Google or Cloudflare when privacy is the priority.
3
In Firefox, set media.peerconnection.enabled to false in about:config to completely disable WebRTC.
4
Chrome users can install the WebRTC Leak Prevent extension to control WebRTC behavior.
5
Run this test periodically, especially after VPN updates or network changes, to catch new leaks early.

Frequently Asked Questions

1

What is a DNS leak?

A DNS leak occurs when your DNS queries (the requests that translate website names to IP addresses) bypass your VPN tunnel and go directly to your ISP's DNS servers. This reveals which websites you visit to your ISP, even though your web traffic itself is encrypted by the VPN.
2

What is a WebRTC leak?

WebRTC (Web Real-Time Communication) is a browser feature used for video calls and peer-to-peer connections. It can reveal your real local and public IP addresses to websites, bypassing your VPN entirely. This is because WebRTC uses STUN servers to discover your IP, and these requests may not go through the VPN tunnel.
3

How do I fix a DNS leak?

Configure your VPN to use its own DNS servers (most VPN clients have this option). Alternatively, manually set your DNS to a privacy-focused provider like Cloudflare (1.1.1.1) or Quad9 (9.9.9.9) and enable DNS-over-HTTPS in your browser settings.
4

How do I fix a WebRTC leak?

In Firefox, type about:config in the address bar and set media.peerconnection.enabled to false. In Chrome, install the WebRTC Leak Prevent extension. Some VPN clients also include built-in WebRTC leak protection.
5

Should I run this test with my VPN on or off?

Run it both ways. First without a VPN to see your baseline (your real IP and ISP DNS servers), then with your VPN active to verify everything is routed through the VPN. If the results look the same in both cases, your VPN is leaking.

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