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DNS Propagation Checker

Compare a record across resolvers.

Queries Google, Cloudflare, Quad9, OpenDNS and Comodo directly and compares their answers.

About the DNS Propagation Checker

After you change a DNS record, resolvers keep serving the old answer until their cached copy expires. This tool asks five public resolvers directly for the same record and compares what they return: Google (8.8.8.8), Cloudflare (1.1.1.1), Quad9 (9.9.9.9), OpenDNS (208.67.222.222) and Comodo (8.26.56.26).

Each resolver's answer is shown with its latency and a Match, Differs or Error badge. The majority answer is the one most resolvers agree on; when all five return the same thing, the record is marked as propagated. Supported types are A, AAAA, MX, TXT, CNAME and NS.

How to use it

  1. Enter the domain or host name you changed, such as www.example.com.
  2. Choose the record type you edited (A by default).
  3. Select Check and compare the answers. Re-run it later if some resolvers still differ.

Examples

Common questions

How long does DNS propagation take?

It depends on the TTL of the old record: resolvers that cached it can keep serving it for up to that many seconds. Name server changes at the registry can take longer because parent-zone NS records often have TTLs of a day or more.

Why do resolvers show different answers even though I changed nothing?

Some DNS setups return different answers by location or load (geo-DNS, CDNs, round-robin), so disagreement is not always a propagation problem.

Can I force resolvers to pick up my change?

Not directly. Lower the TTL well before a planned change, then wait for the old TTL to run out. Some public resolvers offer a cache-flush page for individual names.