Lookup
Query one record type from the resolver you choose, with its TTL and response code.
Free tool
Advanced DNS Lookup
Query any record type, check propagation, trace delegation or look up an IP.
Advanced DNS lookup
Four Lookups in One Tool
Propagation
Ask Cloudflare, Google and other public resolvers at once to see if a change has reached everyone.
Delegation
Trace the path from the root to the domain's nameservers, with DNSSEC and lame-delegation checks.
Reverse (PTR)
Find the hostname for an IP address and confirm it points back, which mail servers check.
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FAQ
Advanced DNS Lookup FAQs
After you change a DNS record, resolvers around the world keep the old answer until it expires. A propagation check asks several public resolvers at once, so you can see when every one returns the new answer.
It's a nameserver listed for a domain that doesn't actually answer for it. Visitors whose resolver picks that server get errors or slow responses, so the site works only some of the time.
Mail servers look up the PTR record of the IP that sends an email. A missing or mismatched PTR record is a strong spam signal, so it matters for any server that sends mail.
The checks run in your free Pheonix account, which keeps them fast and protected from abuse. If you're not signed in, you'll be asked to sign in or create an account, then taken straight to your results.
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