01
The obligation changed in January 2025
ICANN describes the Registration Data Access Protocol as the replacement for WHOIS. Since 28 January 2025, generic top-level-domain registries and registrars generally must provide RDAP but are no longer required to provide WHOIS, with limited exceptions identified by ICANN.
That does not mean every WHOIS server vanished on the same day. It means the standards-based, contractually required path moved. A modern domain-intelligence product should begin with the IANA bootstrap registry and RDAP, then describe any remaining WHOIS result as a secondary or legacy observation.
02
Structured responses reduce guesswork
Traditional WHOIS is free-form text. Labels, date formats, encodings, and field availability vary. RDAP returns JSON with defined objects for events, nameservers, entities, notices, links, status values, and security information.
Structure does not create data that was never published. It does make observed fields easier to validate, internationalize, link, and handle consistently. The distinction matters: a reliable parser is not the same thing as a complete identity record.
03
Redaction is part of the record
Registration data policy determines which fields must or may be published. Personal contact data is often absent or redacted. DomainSense treats that absence as a property of the public response—not as evidence that no registrant or contact exists.
Useful analysis therefore separates registration facts, service-provider facts, public identity, and inferred ownership. Only the first two are commonly present in authoritative RDAP responses.
04
The bootstrap is the routing table
A client should not guess a registry endpoint from the TLD name. IANA publishes an RDAP bootstrap registry mapping DNS labels to services. DomainSense reads that registry first, follows the listed HTTPS service, and links its methodology back to the source.
That sequence—normalize, bootstrap, request, preserve notices, and label missing fields—is the minimum defensible chain for public registration-data work.
SOURCES