New. DNS Leak Test. Is your VPN really hiding your DNS? Find out in seconds.
See what DNS resolver your browser is really using, and whether it leaks your network via EDNS Client Subnet.
edns.upset.dev tells you what DNS resolver your device is really using, and whether it shares part of your network address with the websites you visit. Run the check and see for yourself.
A lookup happens in three steps.
Start a lookup straight from your browser. Nothing to install, no account to create.
Your device asks its DNS resolver to find a one-time address that only we answer, so we see exactly who asked.
We show you the DNS resolver that did the lookup and whether it shared part of your network along the way.
What people reach for edns to figure out.
Confirm a VPN or encrypted DNS is actually routing your queries, not silently falling back to the ISP resolver.
See whether your resolver forwards an EDNS Client Subnet, exposing a slice of your network to upstream authoritative servers.
Understand which resolver and subnet a CDN sees when deciding which edge location to send you to.
Check that a custom DoH or DoT profile resolves through the resolver you configured, from any device.
What ships in the service.
Free, CORS-enabled, no authentication required.
curl -L https://edns.upset.devconst res = await fetch("https://edns.upset.dev/");
const { dns, edns } = await res.json();