SEO Tool

Reverse DNS Lookup

Resolve an IP address back to its hostname. Issues a PTR query against Cloudflare's DNS-over-HTTPS resolver from the edge — works for both IPv4 and IPv6.

About

Reverse DNS (rDNS) maps an IP back to a hostname using PTR records stored under in-addr.arpa (IPv4) or ip6.arpa (IPv6). Mail servers commonly require valid forward-confirmed rDNS before accepting connections.

Backed by cloudflare-dns.com/dns-query (DoH). JSON: /api/reverse-dns?ip=1.1.1.1