What is RDAP and how is it different from WHOIS?

RDAP (Registration Data Access Protocol) is the modern replacement for the classic WHOIS protocol. WHOIS returns unstructured text that varies by registrar; RDAP returns standardized JSON that machines can reliably parse. RDAP also supports authentication and tiered access, allowing registrars to redact personal data for privacy (as required under GDPR) while still serving structured public data.

WHOIS Lookup

About WHOIS Lookup

Queries the RDAP (Registration Data Access Protocol) system to retrieve domain registration data without needing a third-party API key. Shows registrar name, registration date, expiration date, last-updated date, nameservers, domain status codes, and DNSSEC signing status. RDAP is the modern successor to the classic WHOIS protocol, providing structured JSON responses instead of free-text output.

Uses the public RDAP.org aggregator — routes queries to the correct TLD registry automatically
Expiration date highlighted in amber when ≤30 days away, red when already expired
Status codes decoded: clientTransferProhibited, clientDeleteProhibited, clientUpdateProhibited, and more
DNSSEC delegation signing status shown (signed vs unsigned)
No API key required — RDAP is a free, standardized ICANN protocol
Strips http://, https://, and www. prefixes automatically before querying

Frequently Asked Questions

What is RDAP and how is it different from WHOIS?: RDAP (Registration Data Access Protocol) is the modern replacement for the classic WHOIS protocol. WHOIS returns unstructured text that varies by registrar; RDAP returns standardized JSON that machines can reliably parse. RDAP also supports authentication and tiered access, allowing registrars to redact personal data for privacy (as required under GDPR) while still serving structured public data.

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