DNS Leak Test
Advanced DNS leak detection with intelligent analysis - Check if your DNS requests are properly secured
What is a DNS Leak?
A DNS (Domain Name System) leak occurs when your DNS requests bypass your VPN or proxy connection and go directly to your ISP's DNS servers. This exposes your browsing activity even when you think you're protected.
Why DNS leaks matter:
- Your ISP can see every website you visit
- Third parties can track your browsing history
- Defeats the purpose of using a VPN or proxy
- Can reveal your actual location
- Compromises your online privacy
Note: If you're not using a VPN/proxy, seeing your ISP's DNS servers is normal and expected behavior.
How DNS Leaks Happen
DNS leaks can occur due to various reasons:
- IPv6 leaks: Your device uses IPv6 DNS instead of IPv4
- DHCP configuration: Your OS ignores VPN DNS settings
- Split tunneling: Some traffic bypasses the VPN
- WebRTC leaks: Browser exposes real DNS servers
- Poor VPN/proxy config: DNS not properly routed
- Windows DNS priority: System DNS overrides VPN DNS
How to Fix DNS Leaks
Quick fixes:
- Use a VPN with built-in DNS leak protection
- Configure custom DNS servers (1.1.1.1, 8.8.8.8)
- Disable IPv6 on your device
- Use encrypted DNS (DNS over HTTPS)
- Block WebRTC in your browser
- Enable VPN kill switch feature
Best solution: Use a proxy or VPN that routes all DNS traffic through encrypted tunnels, like Coronium's mobile proxies with guaranteed DNS protection.
Understanding Test Results
High Confidence: Test detected clear DNS behavior patterns
Medium Confidence: Some ambiguous results - consider retesting
Low Confidence: Unable to reliably detect DNS servers
Not using VPN/Proxy?
If you see your ISP's DNS servers and you're NOT using a VPN or proxy, this is normal. There's no "leak" because you're intentionally using a direct connection.
Using VPN/Proxy?
DNS servers should match your VPN/proxy provider, not your ISP. If they don't match, you have a DNS leak.
Frequently Asked Questions
How accurate is this DNS leak test?
Our test uses intelligent analysis to detect DNS servers and compare them against your connection. We analyze multiple factors including VPN detection, country matching, and ISP correlation. The test is highly accurate for detecting real leaks while avoiding false positives.
Why does it say "no leak" when I see my ISP?
If you're not using a VPN or proxy, seeing your ISP's DNS servers is completely normal and expected. A "DNS leak" only occurs when you're using privacy tools (VPN/proxy) but your DNS requests are still going to your ISP instead of through your privacy tool.
Can I have DNS leaks even with a VPN?
Yes. Many VPN services have DNS leak issues due to poor configuration, IPv6 leaks, or OS-level DNS settings that override the VPN. Always test your VPN for DNS leaks, especially after updates or configuration changes.
Do mobile proxies prevent DNS leaks?
High-quality mobile proxies like Coronium route all DNS traffic through the proxy connection, preventing leaks. Our mobile proxies include built-in DNS protection with zero-leak guarantee and support for encrypted DNS protocols.
Should I use my ISP's DNS servers?
For privacy, no. ISP DNS servers can track your browsing history, inject ads, and may be slower. Use privacy-focused DNS like Cloudflare (1.1.1.1), Google (8.8.8.8), or Quad9 (9.9.9.9). Better yet, use a VPN/proxy with built-in DNS protection.
What is DNS over HTTPS (DoH)?
DoH encrypts your DNS requests using HTTPS, preventing ISPs and network operators from seeing or tampering with your DNS queries. Modern browsers support DoH and it's highly recommended for privacy. Coronium mobile proxies support DoH/DoT for maximum security.
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Coming Soon: WebRTC Leak Test, IPv6 Leak Test, Browser Fingerprint Test