ICANN Lookup
lookup.icann.org
The registry's own WHOIS record for a domain, with no upsell
No sign-up
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whatsmydns.net
Checks a DNS record from dozens of resolvers around the world at once.
Enter a hostname and record type and it queries public resolvers on every continent simultaneously, showing a map of which ones already have the new value. That is the only reliable way to answer 'has my DNS change propagated', because your own machine's cache tells you nothing about anyone else's. It covers A, AAAA, CNAME, MX, TXT, NS and more. It reads public resolver caches, so it cannot see split-horizon or internal DNS.
AltFTool does this too
If you would rather not leave the site, DNS Propagation Checker covers the same job here — free, no account, and it runs in your browser.
Open DNS Propagation CheckerQuestions
Works the moment the page loads. No account, no email, no trial. Only sees public resolver caches — internal or split-horizon DNS is invisible to it.
Yes. What's My DNS sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Only sees public resolver caches — internal or split-horizon DNS is invisible to it.
Alternatives
Same category or same task, ordered by how closely they overlap.
lookup.icann.org
The registry's own WHOIS record for a domain, with no upsell
downforeveryoneorjustme.com
Settles whether a site is actually down or only down for you
pagespeed.web.dev
Scores a page on real-user Core Web Vitals and lab measurements
ssllabs.com
Grades a site's TLS configuration from A+ down to F and says why
securityheaders.com
Grades the HTTP security headers a site sends and names the missing ones
wave.webaim.org
Overlays accessibility errors directly on top of the page they affect