Online DNS Leak & Privacy Test
Verify whether your internet connection or VPN is leaking unencrypted DNS queries to third-party observers. Detect exposed ISP nameservers, transparent proxies, and unencrypted fallback channels.
Active Connection Analysis
Click below to inspect your observed IP, active resolver ASN, and encryption status.
Ready to Test
Click Test for DNS Leaks above to evaluate your browser's DNS resolution path.
| Observed Parameter | Detected Value | Privacy Status |
|---|---|---|
| Public IP Address | -- | Awaiting test |
| Geo Location / Country | -- | -- |
| Internet Service Provider (ISP / ASN) | -- | -- |
| DNS-over-HTTPS (DoH Encryption) | Supported (TLS 1.3 Active) | Protected |
Four Common Types of DNS Privacy Leaks
A VPN tunnel only protects you if 100% of your DNS traffic passes through its encrypted interface. Here are the most frequent vulnerability vectors:
1. Windows Multi-Homed DNS Leak
Windows uses Smart Multi-Homed Name Resolution (SMHNR) to query all network adapters in parallel and accept the fastest response, frequently leaking your queries over your local Wi-Fi.
2. IPv6 Routing Leaks
If your ISP provides native IPv6 connectivity but your VPN provider only tunnels IPv4 traffic, your computer resolves AAAA records through your plaintext ISP connection without notification.
3. Transparent DNS Proxies
Some ISPs intercept port 53 UDP traffic and redirect it to their own logging resolvers, invisibly overriding custom DNS servers you configured in your router unless you use encrypted DoH.
4. WebRTC Browser Leaks
WebRTC APIs built into Chrome and Firefox can expose your actual local and public IP addresses via STUN requests even when connecting through a VPN.
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DNS Leak FAQs
What is a DNS Leak?↓
A DNS leak occurs when your computer routes DNS lookup requests directly through your local Internet Service Provider (ISP) instead of sending them through an encrypted VPN tunnel. Even though your web traffic payload appears encrypted, your ISP can still monitor, log, and record every single website domain you visit.
How do I tell if my VPN is leaking DNS?↓
When you run this DNS Leak Test while connected to your VPN, the resolved ISP/Organization and location should match your VPN provider server location. If you see your actual residential ISP (e.g. Comcast, AT&T, Verizon, Spectrum, BT, Airtel) listed in the results, your connection is suffering from a DNS leak.
What causes DNS leaks?↓
DNS leaks typically result from: (1) Windows Smart Multi-Homed Name Resolution attempting all available adapters, (2) IPv6 queries bypassing an IPv4-only VPN tunnel, (3) Misconfigured router DNS fallback settings, or (4) WebRTC browser leaks.
How do I fix a DNS leak permanently?↓
You can resolve DNS leaks by: (1) Enabling DNS-over-HTTPS (DoH) inside Windows 11 or macOS settings, (2) Turning on "DNS Leak Protection" and "Kill Switch" inside your VPN client, (3) Disabling IPv6 if your VPN lacks IPv6 leak protection, or (4) Setting static DNS addresses like 1.1.1.1 or 9.9.9.9 on your network interface.