Check hundreds of domain names across all major extensions in seconds. Powered by real RDAP lookups — no guessing, just facts.
Built for founders, developers, and marketers who need to move fast.
Concurrent RDAP lookups check multiple domains simultaneously — hundreds of results in seconds, not minutes.
Uses the official RDAP protocol (the modern WHOIS replacement) for reliable, authoritative availability data.
Check across .com, .io, .co, .net, .org, .app, .dev, .ai, .xyz, .me, .so and .tech in one click.
One-click copy of all available domains to your clipboard. Paste straight into your registrar search.
No account, no credit card, no limits. Just paste your names and go. Always free, always will be.
Fully responsive design that works beautifully on desktop, tablet, and mobile devices.
Enter one domain name per line (no extensions). Select which TLDs to check, then hit the button.
Powered by RDAP.org · Results are indicative — always verify before purchasing.
Simple, transparent, and lightning fast.
Paste a list of domain names — one per line. Just the base name, no extension needed. You can check dozens at once.
Select which TLDs to check. Mix and match from 12 popular options including .com, .io, .ai, .dev, .app and more.
Results stream in live as each lookup completes. Green means available, red means taken. Copy available names with one click.
Everything you need to know about DomainRadar.
We use the official RDAP (Registration Data Access Protocol), which is the modern replacement for WHOIS. It queries the authoritative registry for each TLD directly. Results are highly accurate but we recommend always confirming at your chosen registrar before purchasing.
There's no hard limit on our end. However, very large batches (hundreds of domains × many TLDs) may slow down depending on your internet connection, as each lookup is a live network request. For best performance we recommend batches of 20–50 names at a time.
Some TLD registries have rate limits or don't fully support RDAP yet. If a lookup times out or returns an unexpected status code, we show "Unknown" rather than guessing. Simply rerun the check and most unknowns will resolve on the second attempt.
No. DomainRadar only checks availability — it does not register, reserve, or purchase domains. To register an available domain, head to a registrar like Namecheap, GoDaddy, Cloudflare Registrar, or Google Domains.
Yes, completely free. No account required, no credit card, no usage limits. DomainRadar runs entirely in your browser — no data is sent to our servers.