ICANN WHOIS Sunset 2025: What Changed for gTLDs
Timeline and impact of ICANN's gTLD WHOIS sunset—operator obligations, developer migration, and security workflows.
ICANNWHOIS sunsetgTLDRDAP mandatory
Policy context
ICANN registry agreement amendments removed the contractual requirement for port-43 WHOIS on gTLDs. RDAP is now the authoritative access protocol.
Developer impact
- Scripts hard-coded to WHOIS hosts may fail without warning.
- Implement IANA bootstrap and referral chains for thin registries.
- Track per-TLD RDAP availability and redaction notices.
Security & brand teams
Public RDAP may redact registrant fields. Lawful unredacted access uses RDRS or registrar channels—not bulk scraping.
Migration checklist
- Swap WHOIS libraries for RDAP
- Map JSON instead of regex
- Add retry/cache for 429/5xx
- Monitor TLD coverage