What is a DNS Leak?
A DNS Leak occurs when your web browser bypasses your encrypted VPN connection and sends DNS requests directly to your Internet Service Provider (ISP). DNS (Domain Name System) is the "phonebook" of the internet, translating human-readable domain names (like toolcheckers.com) into IP addresses.
When you use a privacy service like a VPN, your DNS requests should be routed through the VPN tunnel to their secure DNS servers. However, misconfigurations in operating systems (especially Windows) or browsers can sometimes force these requests out into the open, allowing your ISP to see exactly which websites you are visiting, even if the content itself is encrypted.
Why Use Our Advance DNS Leak Test?
Online privacy is only as strong as its weakest link. If your DNS is leaking, your location and browsing history could be exposed.
- Verify VPN Integrity: Confirm that your VPN is actually hiding your DNS queries.
- Detailed Analysis: Unlike basic tools, we attempt to identify the specific owner of the DNS server resolving your requests.
- Privacy First: We do not log your real IP address or browsing data. This test is ephemeral and designed for your security.
- Cross-Platform Accuracy: Detects leaks on Windows, macOS, Linux, iOS, and Android devices.
How to Check for DNS Leaks
Using the Advance DNS Leak Test is straightforward:
- Connect to your VPN: Ensure your privacy software is active.
- Run the Test: Click the "Start Test" button above. The tool will generate specific queries.
- Analyze Results: Look at the "Detected DNS Servers" list.
- Interpret: If the servers listed belong to your VPN provider, you are safe. If they belong to your ISP (e.g., Comcast, AT&T, Verizon), you have a DNS leak.
Other Related Important Concepts
Transparent DNS Proxies
Some ISPs intercept all DNS requests on port 53 and force them through their own servers, regardless of your settings. This is often used for censorship or data collection. Our test helps reveal if this is happening.
WebRTC Leaks
Separate from DNS, WebRTC in modern browsers can sometimes reveal your true local IP address. While this tool focuses on DNS, we recommend checking our WebRTC Leak Tester for complete coverage.