Domain Name Availability

Check if a domain is registered using RDAP WHOIS. Free, no API key, pure client-side.

Checks RDAP databases for domain registration status. Note: "Not found" doesn't guarantee true availability — always verify with a registrar before purchasing.

⚠️ Important Notes

This checks RDAP, NOT a registrar. RDAP can confirm if a domain is registered, but cannot check if it's available for purchase
A "not found" result means the domain is NOT registered — but you still need to buy it through a registrar
Some TLDs (like .io, .ai) have limited RDAP support and may not return accurate results
For purchase, always verify availability with a registrar like Namecheap, Cloudflare, or GoDaddy
RDAP is rate-limited (~200 queries/hour per IP). Don't automate bulk checks.