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SERVER · php

WHOIS / RDAP Lookup

Look up domain registration data using IANA WHOIS referrals and the official IANA RDAP bootstrap registry. Queries go to authoritative registry services, not a commercial WHOIS API.

✓ No commercial API key✓ Direct protocol / authoritative service✓ Short timeouts and safe target validation
About this tool

Look up domain registration data using IANA WHOIS referrals and the official IANA RDAP bootstrap registry. Queries go to authoritative registry services, not a commercial WHOIS API.

How it works

  1. 1Enter the IP, domain, URL or DOI requested by the tool.
  2. 2Run the lookup; Toolardo validates the input before making any network request.
  3. 3Review the returned technical details and retry later if an authoritative service rate-limits the request.

Frequently asked questions

Does this tool use a paid or commercial lookup API?

No. It uses server-native networking or official Internet infrastructure such as DNS, IANA, registry services or the DOI resolver, depending on the tool.

Why can a lookup fail even when the input is valid?

Authoritative services can rate-limit requests, shared hosting can block some outbound ports, DNS may be temporarily unavailable, or the target server may refuse the connection.

Are private network targets allowed?

Tools that make direct HTTP or TLS connections block private, loopback, link-local and reserved IP ranges.

Related tools

DNS Lookup →What Is My IP / IP Lookup →Is Website Down? →SSL Certificate Checker →