DIAG-01 / DIAGNOSTICS
DNS Propagation Checker
Compare a domain's answers across four public resolvers to see how fully a change has propagated.
About the DNS Propagation
When you change a DNS record, the update doesn't reach every resolver instantly — it propagates gradually as caches expire. This tool queries several major public resolvers at once so you can see how far a change has spread and whether they all agree.
What this tool checks
It sends the same DNS query to Google, Cloudflare, Quad9, and OpenDNS and shows each resolver's answer side by side, for the record type you select.
Reading propagation status
If all resolvers return the same up-to-date answer, your change has propagated. If some still show the old value, they're serving cached data that will refresh once the record's TTL expires.
Frequently asked questions
How long does DNS propagation take?
It depends on the record's TTL. Changes usually appear within minutes to a few hours, but can take up to 48 hours in the worst case if the previous TTL was long.
Why do different resolvers show different results?
Each resolver caches records independently. After a change, some may still serve the old cached value until its TTL expires, so you'll see a mix until propagation completes.
How can I make DNS changes propagate faster?
Lower the record's TTL a day or two before making a change. A shorter TTL means resolvers refresh sooner, so your update spreads more quickly when you make it.