Ownership and registration

Investigate a domain or IP

Pull structured registration data with RDAP and resolve an address back to its hostname with reverse PTR.

When to use it

Use this when

  • You need the registrar, registration dates, nameservers, or the network owner of an IP.
  • You have an IP and want the hostname it claims via its PTR record.

Steps

Do this

  1. Query RDAPOpen RDAP / WHOIS and enter a domain or IP. dnsbin returns structured registration, nameserver, and network-ownership data.
  2. Reverse the IPUse Reverse PTR to find the hostname an address claims.
  3. Cross-checkConfirm the PTR’s forward record points back to the same IP — mismatches matter for mail and trust.

Examples

Copyable commands

REST — RDAP
curl 'https://dnsbin.ca/api/v1/rdap?q=example.com'
REST — reverse PTR
curl 'https://dnsbin.ca/api/v1/reverse?ip=1.1.1.1'

Operational notes

Keep in mind

  • RDAP is the structured successor to WHOIS, but not every registry exposes the same fields.
  • PTR records are set by the address’s owner and need not match forward DNS.