DomaIndex is a free bulk domain availability checker. Enter one keyword and instantly see which domain names are available across 100+ TLDs. No signup. Bulk domain name search, in real time Finding an available domain name usually means checking one extension at a time. DomaIndex sends up to 30 parallel queries the moment you search, and each result appears as soon as its registry responds, so slow TLDs never hold up fast ones. Key features Batch TLD lookup — check a keyword across gTLDs, ccTLDs and IDN extensions such as .com, .io, .ai, .dev and .app in one search. Live RDAP data — results come straight from the official registries via RDAP (RFC 7480), the modern replacement for WHOIS. No stale caches. Details for taken domains — see the registrar, registration date and expiry, or inspect the raw RDAP response. One-click registrar links — register an available domain at Cloudflare, Porkbun, Spaceship, Namecheap or GoDaddy. No registrar lock-in. TLD presets and custom groups — start from Startup Picks, Create, Publish, Sell or Regional, or save your own TLD groups. Shareable searches — every query and TLD selection is encoded in the URL. 5 languages — English, Chinese, Japanese, Spanish and German. Who it's for Founders naming a startup, indie makers launching a side project, and developers or domain hunters who need a fast domain checker with no accounts and no usage quotas. DomaIndex is open source and runs on Cloudflare Workers.