The page works as a compact 2ip-style utility: it shows your IP address and technical details useful for website, server, or network diagnostics.
A PTR record helps identify which name the network owner assigned to an IP address. The service also checks whether that name resolves back to the same IP.
ASN, prefix, and RDAP data show which provider or organization manages the address range. This is useful when investigating logs, blocks, and network incidents.
Public DNS does not provide a complete list of domains hosted on one IP. Full reverse IP lookup needs a passive DNS database; here you see only inferable public signals: PTR and names from the default TLS certificate.