Guide
Explainer: the public DNS directory — 15+ providers compared
This IP is a public DNS resolver. We compare 15+ major services — Cloudflare, Google, Quad9, AliDNS, DNSPod and more — on filtering policy, privacy stance, anycast footprint and reachability from mainland China.
Quad9 9.9.9.9 · Switzerland · intermittently reachable from mainland China · 245 PoPs
Trace which IPs a domain has resolved to, or which domains have historically pointed at an IP, with first/last-seen windows. Note: for IP queries the results overlap heavily with Reverse IP, so this tool is better suited to domain lookups; for IP snapshots, use Reverse IP directly.