Look up WHOIS information for a domain name using native WHOIS protocol (TCP port 43). Automatically discovers the correct WHOIS server via IANA if not known. Follows referrals from thin WHOIS to thick WHOIS for complete data. Returns parsed structured data + raw WHOIS text.

Look up RDAP (Registration Data Access Protocol) information for a domain. RDAP is the modern successor to WHOIS, providing structured JSON responses. Automatically discovers the RDAP server via IANA bootstrap. Not all TLDs support RDAP — falls back with a clear error message.

Check if a domain name is available for registration. Tries RDAP first (faster, structured), falls back to WHOIS. Returns availability status and full registration data if registered.

Check multiple domains for availability concurrently. Supports parallel processing with configurable concurrency. Useful for finding available domains across multiple TLDs or name variations.

Get information about a TLD (Top-Level Domain) from IANA. Returns the authoritative WHOIS server, RDAP server, and IANA registry data. Works for gTLDs (.com, .org), new gTLDs (.app, .xyz), and ccTLDs (.uk, .de).

Send a raw WHOIS query to a specific server and return the unprocessed response. Useful for debugging, querying IP WHOIS (rwhois), or non-standard WHOIS servers.

Discover the WHOIS and RDAP servers for a domain or TLD. Checks the built-in database first, then queries IANA for unknown TLDs. Returns both WHOIS and RDAP server information.

Show the IANA RDAP bootstrap data — lists all TLDs that support RDAP and their service URLs. Useful for understanding RDAP coverage across TLDs.