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Tools / DNS-over-HTTPS resolver test

DNS-over-HTTPS resolver test

Queries the Cloudflare and Google DNS-over-HTTPS endpoints straight from your browser and reports whether they respond, and how quickly. Useful for confirming that encrypted DNS is not being blocked by an ISP, a corporate proxy or a captive portal. Only these two are listed because they are the only major resolvers that return the CORS headers a web page needs to read a reply at all. Note what this does NOT do: it cannot tell you which resolver your operating system uses, so it is not a DNS leak test — see the note on the page for why that check cannot be done from a web page at all.

Runs entirely in your browser

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About this tool

DNS is the system that turns a name like example.com into the numeric address your browser connects to. Traditionally these lookups travel in plain text, so whoever runs your network — an ISP, a workplace, a public Wi-Fi operator — can see and even alter them. DNS-over-HTTPS (DoH) wraps those lookups inside an ordinary encrypted HTTPS connection, which both hides their contents and makes them much harder to block or tamper with.

This tool queries the Cloudflare and Google DoH endpoints straight from your browser and reports whether each responds, and how quickly. It is a practical way to confirm that encrypted DNS is reachable on your current network — useful when a captive portal, a corporate proxy or an ISP appears to be interfering with DNS. Only these two providers are tested because they are the major resolvers that return the cross-origin headers a web page needs to read a reply at all.

Be clear about what this does not do: it cannot tell you which resolver your operating system is actually using for everyday browsing, so it is not a DNS leak test. A true leak test requires an authoritative nameserver logging queries, which a web page cannot stand in for. Treat this instead as a reachability and latency check for encrypted DNS — if both endpoints answer quickly, DoH is available to you on this network.

Frequently asked questions

What is DNS-over-HTTPS?
DNS-over-HTTPS (DoH) sends your DNS lookups inside an encrypted HTTPS connection instead of as plain text. This prevents network operators from reading which sites you look up and makes it much harder to block or redirect those lookups.
Is this a DNS leak test?
No. This checks whether your network can reach encrypted DNS providers and how fast they answer. It cannot detect which resolver your operating system uses for normal browsing, which is what a real leak test measures and which cannot be done from a web page.
Why are only Cloudflare and Google tested?
A web page can only read a DoH reply from a server that returns the right cross-origin (CORS) headers. Cloudflare and Google are the major resolvers that do, so they are the ones this browser-based test can query directly.
What does it mean if an endpoint does not respond?
It suggests that encrypted DNS to that provider is blocked or filtered on your current network — common on some corporate networks, captive portals or restrictive ISPs. It can also be a temporary connectivity issue, so try again before concluding it is blocked.
Does this test send my data anywhere?
The queries go directly from your browser to the public Cloudflare and Google DoH endpoints, the same as any DNS lookup would. Nothing about the test is stored on our server.

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