A DNS leak can expose your browsing activity even when you are connected to a VPN. This guide explains what a DNS leak is, how to run a DNS leak test, how to read the result, and how to reduce the risk of leaking DNS requests outside your VPN tunnel.
🔍 Run a DNS Leak Test
Check instantly whether your DNS requests are exposed outside your VPN:
Run DNS Leak Test →What Is a DNS Leak?
A DNS leak happens when your device sends DNS requests outside the secure path you expect, usually outside your VPN tunnel.
DNS is the system that translates domain names like example.com into IP addresses. When you use a VPN, your DNS requests should normally be handled by your VPN provider or by a trusted resolver inside the protected connection.
If your device still sends DNS queries to your ISP, your VPN may hide your IP address while still revealing which websites you visit.
Why DNS Leaks Matter
- 🕵️ Browsing exposure: Your ISP may see the domains you visit.
- 📍 Location clues: DNS servers can reveal your real region or network.
- 🔓 VPN privacy failure: Your traffic may look protected while DNS remains exposed.
- ⚠️ Tracking risk: DNS queries can be used to profile online activity.
How to Run a DNS Leak Test
- Connect to your VPN.
- Open the DNS leak test tool.
- Check which DNS servers appear.
- If the servers belong to your ISP, you may have a DNS leak.
How to Read DNS Leak Test Results
- VPN DNS shown: usually expected when connected to a VPN.
- Trusted DNS shown: usually fine if you intentionally use a provider like Cloudflare, Quad9, or Google DNS.
- ISP DNS shown: possible DNS leak, especially if your VPN is active.
- Multiple unexpected DNS servers: check VPN, browser, and system DNS settings.
With a VPN enabled, a DNS leak test should not normally show your ISP DNS servers.
How Do DNS Leaks Happen?
DNS leaks usually happen because your operating system, browser, VPN app, or network configuration sends DNS queries through the wrong route.
- 🔧 VPN DNS leak protection is disabled
- 💻 The operating system keeps using default ISP DNS
- 🌐 IPv6 traffic bypasses an IPv4-only VPN tunnel
- 🧭 Browser Secure DNS uses a separate resolver
- 🧱 Firewall or antivirus software interferes with VPN routing
- 🔀 Split tunneling excludes the browser from the VPN path
How to Prevent DNS Leaks
- ✔️ Enable DNS leak protection in your VPN app.
- 🔒 Enable your VPN kill switch.
- 🌐 Use a VPN that supports IPv6, or disable IPv6 if unsupported.
- 🧰 Use trusted DNS resolvers such as
1.1.1.1,9.9.9.9, or your VPN DNS. - 🧪 Test regularly after changing VPN, browser, or network settings.
DNS Leak vs IP Leak
A DNS leak and an IP leak are related privacy issues, but they are not the same.
- DNS leak: exposes domain lookups.
- IP leak: exposes your real public IP address.
A VPN can hide your public IP while still leaking DNS requests, which is why testing both matters.
DNS Leaks and VPNs
VPNs are supposed to route DNS requests through a protected tunnel. However, not all VPN configurations handle DNS correctly. If your VPN app has options like Use VPN DNS, DNS leak protection, or Block outside DNS, enable them before testing again.
For detailed step-by-step fixes, read: DNS Leak Test and Fix Guide.
FAQ: DNS Leak Test
What is a DNS leak test?
A DNS leak test checks which DNS servers handle your domain lookups. It helps detect whether your DNS requests are going through your VPN or leaking to your ISP.
How do I know if my DNS is leaking?
If your VPN is connected and the test shows DNS servers from your ISP, you may have a DNS leak.
Can a VPN still leak DNS?
Yes. A VPN can leak DNS if DNS protection is disabled, misconfigured, or bypassed by system or browser settings.
Is a DNS leak dangerous?
A DNS leak can expose the domains you visit. It does not usually reveal the full content of HTTPS traffic, but it can reduce privacy significantly.
How often should I run a DNS leak test?
Run a DNS leak test after changing VPN servers, updating your VPN app, switching networks, or changing browser DNS settings.
Check Your DNS Privacy Now
DNS leaks are silent, but easy to test. If you use a VPN for privacy, run a quick DNS leak test and verify that your DNS requests are not exposed.