A DNS leak occurs when your DNS queries bypass your VPN tunnel and go directly to your ISP's DNS servers, exposing which websites you visit even while connected to a VPN.

Why does my VPN have a DNS leak?

Common causes include: your OS using ISP DNS servers by default, IPv6 traffic not being routed through the VPN, misconfigured VPN settings, or your VPN not forcing DNS through its tunnel.

How do I fix a DNS leak?

Force your VPN to use its own DNS servers, disable IPv6 if your VPN doesn't support it, enable the VPN's kill switch feature, or manually configure your system to use privacy-focused DNS like 1.1.1.1 or 9.9.9.9.

Can I run a DNS leak test on mobile?

Yes, this DNS leak test works on both desktop and mobile browsers. Simply visit this page on your phone or tablet while connected to your VPN and click Run DNS Leak Test.

What DNS servers should I see if my VPN is working?

If your VPN is working correctly, you should see DNS servers owned by your VPN provider or privacy-focused DNS services-not your ISP's DNS servers.

DNS Leak Test: What It Is & How to Fix Leaks (Fast Guide)

Your IP Address

216.73.216.108

Takes about 10-15 seconds

Checking...

Detected DNS Resolvers

What This Means

DNS Leak: When your DNS queries go to a server outside your VPN tunnel, exposing which websites you visit to your ISP or other third parties.

Privacy DNS: Services like Cloudflare (1.1.1.1) or Quad9 that don't log your queries and provide encrypted DNS.

ISP Resolver: Your Internet Service Provider's DNS server, which can see and log all your DNS queries.

Disclaimer: DNS leak tests aren't perfect. Results can vary based on VPN settings, browser behavior, and network configuration. If you see unexpected results, try clearing your browser cache and running the test again.

Debug Console

Waiting for test to start...

No data yet

How This Test Works

We generate unique hostnames under our test domain (leak.zend2.com)
Your browser makes requests to these hostnames, triggering DNS lookups
Our authoritative DNS server logs which resolvers query for these hostnames
We analyze the resolver IPs to identify who handles your DNS queries
If we see ISP resolvers when you're on a VPN, that indicates a DNS leak