DNS Propagation
Check DNS propagation across multiple public resolvers. Compare Google, Cloudflare, Quad9, and more.
DNS propagation is the time it takes for a DNS change to be reflected by resolvers worldwide. This tool queries the same record across several major public resolvers — Google, Cloudflare, Quad9, OpenDNS, AdGuard, and Mullvad — and compares their answers, so you can see whether an update has spread or is still cached in places. When every resolver agrees, propagation is complete.
Frequently asked questions
What is DNS propagation?
It’s the lag while DNS changes spread, as resolvers gradually replace cached records once their TTL expires. Different resolvers update at different times.
Why do resolvers show different answers?
Some still serve the old cached record while others have the new one. Disagreement means the change hasn’t fully propagated yet.
How long does propagation take?
Usually minutes to a few hours, governed by the record’s TTL; long TTLs can extend it up to about 48 hours.
Can I speed it up?
Lowering the TTL before making a change helps future updates propagate faster, but it can’t undo caching already in flight.
What does it mean when all resolvers agree?
Propagation is effectively complete — every tested resolver is serving the same, current record.