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DNS TOOLS

DNS Tools

A set of IP-reverse-related DNS lookups: subnet PTR scanning / domains hosted on an IP / domain ↔ IP history timeline.

More DNS lookups → dns.nf
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

Batch PTR reverse lookup over an IPv4 CIDR block, grouped by naming pattern.

Find all public domains hosted on a given IPv4, aggregated and deduplicated across multiple sources.

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.

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