Check if your DNS queries are leaking outside your VPN or encrypted tunnel.
DNS (Domain Name System) is the phonebook of the internet — it translates human-readable domain names like google.com into IP addresses that computers use to connect. Every time you visit a website, your device sends a DNS query to a DNS resolver to look up the address.
When you use a VPN, all your internet traffic should pass through the encrypted VPN tunnel, including DNS queries. A DNS leak happens when some DNS queries bypass the VPN and go directly to your ISP's DNS servers. This means your ISP can see which websites you visit, even though you're using a VPN — defeating the purpose of the VPN for privacy.
DNS leaks can occur due to: improperly configured VPN software, operating system default DNS settings overriding VPN DNS, IPv6 traffic not being routed through the VPN, Windows "Smart Multi-Homed Name Resolution" feature, or your VPN disconnecting briefly and traffic being sent directly.
This DNS leak test sends multiple DNS queries through unique subdomains. By checking which DNS resolvers respond to these queries, we can identify how many different DNS providers are handling your requests. If you see your ISP's resolver while connected to a VPN, your DNS is leaking.
A DNS leak occurs when your DNS queries bypass your VPN tunnel and are sent to your ISP's DNS servers instead. This exposes your browsing activity — your ISP can see every website you visit, even while you're connected to a VPN.
Enable your VPN's built-in DNS leak protection, manually set your DNS to a privacy provider like 1.1.1.1 (Cloudflare) or 9.9.9.9 (Quad9), disable IPv6 if your VPN doesn't support it, and flush your DNS cache after connecting to your VPN.
DNS (Domain Name System) translates human-readable domain names like google.com into numeric IP addresses that computers use. It works like a phonebook for the internet. Every website visit starts with a DNS query, making DNS a critical part of your internet privacy.
A DNS leak compromises your privacy by revealing your browsing activity to your ISP and potentially other third parties. While it doesn't expose the content of encrypted traffic, it reveals which websites you visit, which can be sensitive information, especially in privacy-critical scenarios.
Click the "Run DNS Leak Test" button above. The test sends multiple DNS queries and examines which resolvers respond. If you see your ISP's DNS resolver while connected to a VPN, you have a DNS leak that needs to be addressed.