Test your connection for DNS leaks while using a VPN or proxy. Identify DNS resolvers, compare them with your expected VPN path, and check for unexpected DNS exposure.
Configure query depth and expected network path
All observed DNS queries were handled by a single consistent DNS resolver network.
| Resolver IP | Provider / ASN | Country | Queries |
|---|---|---|---|
| No DNS resolver probes executed yet. Click "START DNS LEAK TEST". | |||
Chart will generate automatically after probe completion.
No previous session logs stored locally.
EasyToolio provides three distinct, complementary browser diagnostic tools to inspect every layer of your connection identity.
Focus: Browser P2P IP Exposure
Evaluates whether W3C RTCPeerConnection and STUN candidate binding requests bypass your VPN to leak ISP-assigned public or private IPs.
Focus: Visible Connection Identity
Synthesizes HTTP public IP, dual-stack IPv4/IPv6 exposure, and expected VPN exit gateway consistency into a unified privacy verdict.
Focus: Recursive Resolver Exposure
Tracks which recursive DNS servers process your domain lookups using authoritative single-use subdomain probes.
A DNS leak happens when internet domain requests bypass your VPN tunnel and are sent directly to your ISP or third-party recursive DNS servers.
Recursive resolvers look up IP addresses for domain names on your behalf, while authoritative servers maintain the official domain records.
DoH and DoT encrypt DNS queries between your browser/system and DNS provider, guarding against local Wi-Fi eavesdropping and ISP hijacking.
By generating unique single-use subdomains, our diagnostic server inspects which recursive resolver IP address actually fetches the DNS record.
Quick answers about how this tool works.
Connect to your VPN and start this test. The tool triggers unique DNS lookups to an authoritative test server and identifies which recursive resolvers process the queries.
The test generates unpredictable, single-use subdomains. When your browser attempts resolution, the authoritative nameserver logs which recursive resolver queried it.
Yes. DNS leaks can happen if your VPN software lacks built-in DNS leak protection, if split tunneling is misconfigured, or if your OS overrides DNS settings.
You should see DNS resolvers belonging to your VPN provider or designated secure DNS service. You should NOT see your local ISP's DNS servers.
DNS-over-HTTPS encrypts DNS queries via HTTPS protocols (port 443), preventing local network eavesdropping and ISP DNS tampering.
DoH encrypts DNS traffic between your browser and the DoH provider, but if that provider is outside your VPN tunnel, it may still expose your query activity.
If your ISP DNS appears while your VPN is connected, your VPN is failing to route DNS requests through the encrypted tunnel, indicating an active DNS leak.
Multiple resolvers can appear if your OS or browser uses fallback DNS servers, dual-stack IPv4/IPv6 resolvers, or load-balanced DNS pools.
A DNS leak reveals which DNS server resolves your web requests. A WebRTC leak reveals your real public or private IP address via browser P2P connection APIs.
Enable DNS Leak Protection in your VPN client, force your OS to use static secure DNS servers (e.g. Cloudflare 1.1.1.1), or disable smart multi-homed resolution in Windows.
No. Test tokens expire in 180 seconds, and no permanent DNS query logs or IP history are stored.
Plain-language explainers that sit next to this tool.
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