Comprehensive TCP and UDP DNS leak detection for proxies and VPNs. Instant results.
Using PROXIES.SX Proxies? Get your proxy credentials from your dashboard and enter them below in the format: host:port:user:pass
We test both TCP and UDP DNS to ensure comprehensive leak detection. Results show if DNS queries are properly routed through your proxy.
Detecting your IP...
TCP Test: Checks if DNS queries leak through TCP protocol
UDP Test: Verifies DNS requests don't bypass your proxy via UDP
Privacy Note: DNS leaks expose which websites you visit to your ISP, even when using a proxy or VPN.
Understanding DNS leaks and why they threaten your privacy
DNS leaks occur when your DNS queries bypass your proxy or VPN and go directly to your ISP's DNS servers. This exposes which websites you visit, even though your connection appears to be protected.
DNS leaks typically occur due to misconfigured network settings, operating system behavior, or proxy/VPN software that doesn't properly handle DNS requests.
Your ISP, government, or network administrators can track every website you visit, defeating the purpose of using a proxy.
DNS queries reveal your real IP address and location, even when you're trying to appear from a different region.
Leaked DNS data can be used for targeted attacks, censorship, or to build a profile of your online activities.
For businesses, DNS leaks can expose competitive research, market strategies, and confidential browsing patterns.
Organizations subject to GDPR or other privacy regulations may face compliance violations if DNS leaks expose user data.
You believe you're protected, but your DNS queries reveal everything. This false sense of security is often worse than no protection.
Comprehensive testing using industry-standard protocols
Tests DNS queries over TCP protocol to ensure they're routed through your proxy and not leaking to your ISP.
Checks UDP-based DNS queries (the most common type) to verify complete DNS traffic protection.
Both tests are required for comprehensive DNS leak protection. Our tool automatically runs both TCP and UDP tests to ensure complete coverage.
If our test detects DNS leaks, here's how to fix them
Configure your system to use DNS servers provided by your proxy or VPN service instead of your ISP's DNS.
Many proxies don't handle IPv6 properly. Disable IPv6 on your system to prevent DNS leaks through IPv6 connections.
Many VPN/proxy clients have built-in DNS leak protection. Enable this feature in your client settings to automatically route all DNS through the tunnel.
DNS leaks can occur after system updates or network changes. Test regularly to ensure ongoing protection, especially after configuration changes.
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