What Is DNS Leak Protection? Simple VPN Privacy Guide
Quick answer
DNS leak protection keeps website lookups inside the VPN path
DNS is the lookup system your device uses to find websites. A DNS leak happens when those lookups bypass the VPN, even while the VPN appears connected. DNS leak protection helps route DNS requests through the VPN's protected resolver instead of your ISP, router, hotel, airport, or café Wi-Fi network.
A VPN can hide the final websites you visit from your ISP only if the DNS path is protected too. If DNS requests leak, the traffic may still be encrypted, but the lookup trail can reveal the domains your device asked for.
DNS leak protection is not flashy, but it is one of the most important privacy basics to check before trusting a VPN on public Wi-Fi or a network you do not control.
Common DNS leak scenarios
| Leak type | What happens | Why it matters |
|---|---|---|
| DNS requests use your ISP | Your browser asks the ISP resolver for website lookups even though the VPN is connected | The ISP or local network may infer sites you visit |
| DNS requests use the local Wi-Fi | Hotel, airport, office, or café DNS servers handle lookups | Network owners may see destination lookups |
| IPv6 leaks | The VPN handles IPv4 but leaves IPv6 traffic outside the tunnel | Your real network identity can be exposed |
| App-specific leaks | A browser, extension, or app bypasses the protected resolver | One app may expose lookups while others are protected |
DNS leak protection checklist
- Connect the VPN and run a DNS leak test before using unfamiliar Wi-Fi.
- Check whether the VPN app has its own DNS leak protection setting and leave it enabled.
- Test after switching servers, waking a laptop from sleep, and moving between Wi-Fi networks.
- Use the kill switch as a separate safety layer; it helps when the VPN drops, while DNS leak protection helps while it is connected.
- Be extra cautious with unknown free VPN apps that do not explain DNS handling or leak protection clearly.
DNS leak protection vs a kill switch
DNS leak protection and a kill switch solve different problems. DNS leak protection helps while the VPN is connected by keeping lookups on the protected path. A VPN kill switch helps if the VPN drops by blocking traffic until the tunnel returns.
For safer everyday use, especially on public Wi-Fi, you want both features enabled. If a VPN app hides these settings or does not explain them, treat that as a reason to compare alternatives.
FAQ
Does HTTPS stop DNS leaks?
No. HTTPS protects the connection to a website, but DNS lookups can still reveal the domains your device asks for unless the DNS path is protected.
Can my ISP see DNS requests with a VPN?
A well-configured VPN should prevent that for normal traffic. If DNS requests leak to the ISP resolver, the ISP may see domain lookups even while the VPN is connected.
Should DNS leak protection affect which VPN I buy?
Yes. DNS leak protection, kill switch behaviour, no-logs evidence, app quality, and refund terms should all be part of your shortlist. Use the VPN Buyer Checklist before buying.
Where to go next
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