DNS
PROPAGATION
Changed your DNS and want to know if the world can see it yet? Enter the domain and we query major public resolvers, Google, Cloudflare, Quad9, OpenDNS and more, and compare what each returns. When they all agree on the new value, your change has propagated.
What is a DNS Propagation Checker?
A DNS propagation checker is a free tool that queries public resolvers around the world (Google, Cloudflare, Quad9, OpenDNS and more) to see whether a DNS change has gone live everywhere. When every resolver returns the new value, the change has fully propagated; a mix means caches are still expiring.
How does a DNS Propagation Checker work?
- 01We ask each major public resolver for the domain’s A records.
- 02Answers are compared to see whether resolvers agree.
- 03Full agreement means the change has propagated; a mix means caches are still expiring.
Frequently asked questions
How long does DNS propagation take?
It depends on the TTL of the record you changed. Resolvers cache answers for the TTL duration, so a record with a 5 minute TTL updates worldwide quickly, while a 24 or 48 hour TTL takes that long to fully expire everywhere. Lower the TTL a day before a planned migration and the cutover becomes near-instant.
Some resolvers show the new value and some the old. Is that normal?
Yes, that is what propagation in progress looks like. Each resolver expires its cache on its own schedule, so a mixed result simply means some caches still hold the old answer. If it persists well past the TTL, check that the change was actually saved at the authoritative nameserver.
Why do resolvers disagree even after days?
Persistent disagreement usually means two authoritative sources are answering differently, often because the domain still lists old nameservers alongside new ones at the registrar. Check the NS records with our DNS Checker and make sure only the intended nameservers are delegated.