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DNS Propagation Checker

Check DNS record propagation across major public resolvers.

Last validated: Pending

DNS Propagation Checker queries several public recursive resolvers and compares their answers for the same hostname and record type. It is useful after DNS changes when some users still reach old infrastructure while others see the new record. The tool reports per-resolver status, returned values, and a propagation percentage so you can quickly assess consistency. If you provide an expected value, it will explicitly mark which resolvers match versus mismatch. Use this during cutovers, incident triage, and verification of records such as A, AAAA, CNAME, MX, TXT, and NS.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

DNS Propagation Checker

Compare what major public resolvers currently return for a DNS record.

Summary

Enter a hostname and run the check.

How to use this tool

Enter a hostname and choose the DNS record type you want to validate.
Optionally enter an expected record value to enforce match checking.
Run the checker and review per-resolver status, returned values, and latency.
Use the propagation percentage and mismatch rows to decide whether to wait, flush caches, or investigate stale resolver paths.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Host:
Record type: A
Expected value:

Expected Outputs

Interpretation

Confirm unit consistency and operational constraints before applying this result in production or field conditions.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Formula References

IPv4/IPv6 addressing rules and common protocol arithmetic.
DNS/WHOIS/network calls depend on external resolvers and current network state.

Assumptions

Results depend on public resolver cache state and can change minute to minute.
Timeouts or errors may reflect temporary network conditions, not necessarily wrong DNS zone data.
This tool checks recursive resolver visibility, not authoritative DNS zone configuration correctness by itself.

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