DNS Leak Test

What Is a DNS Leak?

A DNS (Domain Name System) leak occurs when your DNS queries are sent outside your VPN or proxy tunnel – typically to your Internet Service Provider's DNS servers. Even if your IP address is hidden behind a VPN, a DNS leak means your ISP can see every website you visit by reading your DNS lookup traffic.

This happens when your operating system or browser bypasses the VPN's DNS configuration and falls back to the system's default DNS servers. It's a common issue with certain VPN clients, split-tunnel configurations, and some browser extensions.

How This Test Works

Our DNS leak test analyzes your connection in real time. It checks whether your IP address belongs to a known VPN or proxy provider, detects any WebRTC leaks that could reveal your real network addresses, and looks up the network provider for each IP found. If multiple different network providers are detected, it may indicate that some traffic is leaking outside your VPN tunnel.

How to Fix a DNS Leak

To prevent DNS leaks: use a VPN that forces DNS queries through the encrypted tunnel; enable DNS leak protection in your VPN client settings; consider using DNS-over-HTTPS (DoH) or DNS-over-TLS (DoT) in your browser; and disable WebRTC in your browser if you need maximum privacy. ProxyFreeOnly offers free proxy and VPN lists to help you secure your connection.