Registration Data Access Protocol — Modern replacement for WHOIS. Query domain and IP registration data with privacy protection and standardized responses.
Enter a domain name, IP address, or ASN to view RDAP registration data
Registration Data Access Protocol (RDAP) is the modern replacement for WHOIS, developed by the IETF. It provides:
Standardized redaction of personal information
Supports UTF-8 and non-ASCII characters
Machine-readable responses for automation
Standardized endpoints and HTTP methods
| Feature | RDAP | WHOIS |
|---|---|---|
| Format | JSON | Plain text (inconsistent) |
| Privacy | ✅ Standardized redaction | ❌ Varies by registrar |
| Internationalization | ✅ UTF-8 support | ❌ ASCII only |
| Protocol | RESTful API (HTTPS) | Port 43 (TCP) |
| Data Types | Domains, IPs, ASNs, Entities | Primarily domains |
Unique identifier for the object
Registrar, registrant, admin, tech contacts
Registration, expiration, last changed dates
Related resources and self links
Object status (active, inactive, etc.)
IANA registry identifiers