Enter an IPv4 address, IPv6 address, or hostname. We resolve public addresses safely, then query PTR (reverse DNS). This is not passive DNS and cannot list every site on a CDN or shared host.
For an IP address, Compathub queries PTR records through public DNS. PTR usually returns one provider hostname (for example dns.google), not a list of every website using that address.
For a hostname, we resolve public A and AAAA records (up to eight addresses), then run PTR for each address. Results show which IP each PTR belongs to.
When PTR names exist, we run a forward-confirmed reverse DNS (FCrDNS) check for each target IP: resolve the PTR name to A/AAAA records and see whether that specific IP appears. TTL values are shown when the resolver returns them (seconds a response may be cached). Stage timings are approximate resolver round-trips, not authoritative performance metrics.
Your query is sent to Compathub's API so our server can perform DNS lookups. Public DNS resolvers on the internet may see those queries. Compathub does not send your query to a third-party reverse-IP vendor in the default configuration. Lookups are not stored as a searchable history.
IP: 8.8.8.8 often returns a PTR such as dns.google when published by the operator.
Hostname: one.one.one.one resolves to Cloudflare anycast addresses; PTR names may be generic.
Pair with DNS Lookup for forward records, the SSL Certificate Checker for TLS expiry and issuer on port 443, the Website Response Time Checker for server-side response timing, Website Stack Checker to inspect a site, Redirect Checker for URL behaviour, and Security Headers Checker on the live URL.