Avail review
A focused, self-hosted domain checker for batch TLD research and WHOIS inspection.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Avail is an open-source domain availability checker for developers, domain investors, and branding professionals. It checks domain availability across multiple top-level domains and presents live WHOIS and RDAP registration data, including registration dates, registrar information, nameservers, and registry details. Its web, API, and self-hosted formats make it suitable for users who want direct access to domain research rather than a registration service.
Its strongest area is domain-data inspection. Avail combines live WHOIS lookups with RDAP fallback, then organizes results through multi-panel inspection. TLD search and filtering help narrow checks, while batch checking supports research across selected TLDs. The application also keeps local search history and uses responsive desktop and mobile layouts. The documentation states that the API accepts up to 100 TLDs per request, while the live site shows a 10-TLD UI selection indicator, making the API the more expansive route for larger checks.
Avail is a focused research tool, not an end-to-end domain workflow. It is stateless and read-only, so it does not register domains, provide domain pricing or valuation, or connect with registrars. That makes it a good fit for teams and individuals who need inspectable WHOIS and RDAP data, batch availability checks, and self-hosted access. Buyers seeking registration, valuation, pricing, or registrar actions should choose a tool built around those functions instead.
Avail pros and cons
- Where it wins
- Live WHOIS with RDAP fallback and registration data
- Batch checks across selected TLDs with TLD filtering
- Web, API, and self-hosted access with local search history
- Where it doesn't
- Read-only and does not provide domain registration
- No domain pricing, valuation, or registrar integrations
- The web interface shows a 10-TLD selection indicator
Avail fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update