When to use it
Spot resolver disagreement after a DNS change and see whether responding operators have converged on the same answer.
Site diagnostics
DNS Propagation Checker
Compare A, AAAA, CNAME, MX, NS, or TXT answers across six independent named public recursive resolver operators.
Uses a protected server check
Run the tool
Only public web targets are accepted. Private and reserved network ranges are blocked.
What this check means
Queries Google, Cloudflare, Quad9, OpenDNS, AdGuard DNS, and Control D. This is resolver comparison rather than a fabricated geographic propagation map.