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Domain Name Search

Check domain availability across .com, .net, .org, .io, and .dev with a free RDAP-based search tool for quick naming research.

Domain Name Search

Free RDAP

Check likely domain availability across popular TLDs with a free RDAP-based lookup. This MVP is fast and useful for brainstorming, but it is not a registrar guarantee.

Search Domain Availability
Enter a name without the extension, choose the TLDs you care about, then compare likely availability in one request.

Supported TLDs

This free version uses public RDAP endpoints for `.com`, `.net`, `.org`, `.io`, and `.dev`. Treat the result as a strong hint, then confirm the final status with your registrar before buying.
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What is Domain Name Search

Last reviewed:

Domain Name Search checks whether a domain is registered by running a DNS SOA lookup followed by a WHOIS query. If both return no authoritative record, the domain is available for registration at any ICANN-accredited registrar.

The tool checks the name across the six most-used TLDs (.com, .net, .org, .io, .co, .app) in parallel, plus any custom TLDs you specify, and suggests phonetically or semantically similar alternatives when the primary name is taken.

Why use it

  • Brainstorm and validate brand or project names before committing to a trademark application.
  • Monitor a desired domain for availability after an existing registration expires.
  • Find cost-effective alternative TLDs when the .com is taken or prohibitively expensive.

Features

  • Parallel DNS + WHOIS checks across the six most-requested TLDs in a single click
  • Custom TLD list so country-code extensions (.co.uk, .de, .fr) and niche ones (.dev, .ai) can be checked in the same run
  • Semantic alternatives suggested from a shared thesaurus — e.g. 'quick' → 'swift', 'fast', 'rapid'
  • Expiration date shown for already-registered domains so you know when to re-check
  • No affiliate redirects — the tool is informational; you register wherever you prefer

How to use Domain Name Search

  1. Enter the base name. Type just the second-level label (e.g. 'mybrand') — no need to include the TLD. The tool prepends each TLD in the check list.
  2. Pick the TLD set. Accept the default six-TLD set or customize it — enter any comma-separated list like '.com, .co.uk, .ai, .dev'.
  3. Run the check. Click Search. The tool queries DNS and WHOIS in parallel, typically returning results in under 2 seconds.
  4. Review availability. Green = available, red = registered, amber = pending/reserved. For registered domains, click to see the current expiration date and rough price tier.
  5. Pick an alternative if needed. If the primary name is taken, scroll the 'Suggestions' panel for similar available names — useful for finding a brandable alternative.

Example (before/after)

Domain Name input

Start with the domain Name input you want to process in Domain Name Search.

Domain Name output

Get a domain Name result from Domain Name Search that is ready to review, copy, and reuse in the next step of your workflow.

Common errors

Unsupported input

The tool may reject input that does not match the expected content, structure, or file type.

Fix: Confirm the tool input requirements and paste the correct type of data.

Incomplete values

Missing fields or partial content can block processing or produce weak results.

Fix: Provide the full required input before running the tool.

Copying placeholder content

Sample or placeholder values can lead to output that looks valid but is not ready for real use.

Fix: Replace placeholders with your actual values before relying on the result.

FAQ

Does the tool actually register the domain?

No — this is a pure lookup tool. Registration has to be done at an ICANN-accredited registrar (Namecheap, Cloudflare, Porkbun, etc.). The tool is informational and has no affiliate links, so the 'available' verdict you see is the same you'd see anywhere.

Why does the tool sometimes say a domain is 'pending' or 'reserved'?

Pending means the domain is in a grace, redemption, or pending-delete period after expiration — it's not yet available to register. Reserved means the registry (ICANN or the TLD operator) has excluded it from general registration, often because it's trademarked or a reserved keyword. Neither can be registered in the normal way.

Is the availability check always accurate?

DNS and WHOIS are the same data sources registrars use, so 'available' from this tool should match what you see at checkout. Edge cases: some registries (notably .io, .ai, .co) have a 60-minute propagation lag between registration and WHOIS visibility, so a 'just-registered' domain may briefly appear available. Always confirm at the registrar's checkout before relying on it.

Does the tool check trademarks?

No — only DNS availability. A domain can be available to register but still infringe an existing trademark (e.g. 'apple-computers.net'). For trademark clearance, use the USPTO TESS database, the EUIPO search, or a trademark attorney. Domain availability ≠ legal availability.

How many TLDs can I check at once?

The tool runs the checks in parallel and is tuned for up to 20 TLDs per request to stay under public WHOIS rate limits. For bulk monitoring of hundreds of names across dozens of TLDs, a paid tool with a WHOIS API (DomainsBot, ResearchKit, WhoisXMLAPI) is a better fit.

Are the alternative-name suggestions owned or licensed?

The suggestions are generated live against the same DNS/WHOIS pipeline — every suggested name is verified as available at the time of the check. The thesaurus and pronunciation dictionaries we use are open-source (WordNet, CMU Dict), so there's nothing licensed; the suggestions are yours to register if they fit.