DNS Propagation Checker
Check whether a DNS change has propagated by querying the same record at several public resolvers — Google, Cloudflare, DNS.SB and AdGuard — at once. Free, nothing stored.
About DNS propagation
Every DNS resolver keeps a record in its cache for the length of the record's TTL (time to live). When you change a record, resolvers that still hold the old value keep serving it until the TTL expires, so a change rolls out gradually across the internet — this is propagation. Checking several major public resolvers at once is the quickest way to confirm a change is live where it matters, or to see that it is still rolling out. Tip: lower the TTL a day before a planned migration so the switch propagates in minutes, not hours.
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Frequently asked questions
What is DNS propagation?
When you change a DNS record (e.g. point a domain to a new server), the change has to spread to DNS resolvers around the world. Until every resolver has the new value, some visitors see the old one and some the new — the record is still propagating. It can take from minutes to 48 hours, depending on the record's TTL.
How does this checker work?
It asks the same record at several big public resolvers (Google, Cloudflare, DNS.SB and AdGuard) at once and compares their answers. If they all return the same value, the change has propagated across them; if they differ, it is still in progress.
Why do some resolvers still show the old value?
Each resolver caches a record for its TTL. A resolver that cached the old value will keep serving it until the TTL expires, then fetch the new one. Lowering the TTL before a planned change makes future changes propagate faster.
Is this the same as a global location check?
It checks several independent public resolvers rather than dozens of city locations, which is enough to confirm a change is live on the major resolvers most people and networks use.
Does it store what I check?
No, nothing is stored. For a full record dump use the DNS Lookup, and for the IP details the IP Lookup.