DNS Propagation Checker
Check DNS record propagation across major public resolvers.
DNS Propagation Checker compares answers from several public recursive resolvers for the same hostname and record type. DNS propagation is not a single global broadcast; it is the gradual disappearance of cached old answers as resolver TTLs expire and new queries reach authoritative nameservers. A resolver may show the new value while another still returns the previous value, especially after record edits, nameserver changes, or DNSSEC updates. The tool reports per-resolver status, returned values, and match percentage when an expected value is supplied. Use it during cutovers and incident triage, remembering that authoritative records, TTL settings, and client-side caches all influence what users actually see.