See if a domain name is available across every common TLD at once, or bulk-check a whole list. Free, instant, no signup. Priority on .com and .in.
Leave blank for the default ~20 TLDs. .com and .in always shown first.
Priority TLDs .com and .in by default. One name per line, up to 200. Export results as CSV after.
Ready when you are.
Enter a name, or a whole list, to see what's available.
Available Taken Unknown
POWER USER?
WebToolsHub CLI
Every WebToolsHub tool has a command line too. The domain command uses authoritative RDAP registry data (most accurate) with DNS cross-checks, and supports bulk files, CSV export, and available-only filtering.
# single name across all common TLDs
python cli.py domainmycoolsite# bulk file, .com + .in priority, only free ones, export CSV
python cli.py domain --file names.txt --tldscom,in--available --csv > free.csv
# run the local web server (this page, backed by RDAP)
python server.py
THE BIG DIFFERENCE
Check domains from inside your AI
This tool speaks the Model Context Protocol (MCP) and ships a REST API. Connect it to your assistant once, then just ask it to check a domain for you.
A domain availability checker tells you whether a domain name is unregistered and free to buy, or already taken. This tool checks a name across every common TLD at once (.com, .in, .net, .io, .ai and more) so you can see all your options in one place instead of searching one extension at a time.
How to check if a domain name is available
Type the name you want (without a dot) into the box above.
Optionally enter your own list of TLDs, or leave it blank for the default set.
Select Check. Results show as available, taken, or unknown in a few seconds.
For many names at once, open the Bulk tab, paste or upload a list, and export the results as CSV.
How availability is verified
Every result is confirmed against authoritative sources, not guessed. The checker queries RDAP registry data first, then cross-checks DNS records. A name is only marked available when there is no registration record and no DNS record. When no public source can confirm the status, it is marked unknown instead of showing a false positive, so you can trust an available result before you buy.
Why .com and .in are prioritised
.com is the most trusted global extension and .in is the leading choice for India, so both are always checked first and shown at the top of your results. You can still check any TLD by entering your own list.
Frequently asked questions
How do I check if a domain name is available?
Type a name into the Domain Name Checker and it checks that name across every common TLD at once (.com, .in, .net, .io, .ai and more), showing which are available, taken, or unknown. No signup is needed and results appear in a few seconds.
Can I check many domain names at once in bulk?
Yes. Switch to the Bulk tab, paste up to 200 names or upload a .txt or .csv file, pick your TLDs (.com and .in by default), and the tool checks every name and lets you export the results as CSV.
Is the Domain Name Checker free and open source?
Yes. It is completely free and open source under the MIT license, part of WebToolsHub by Konko Maji. It runs in your browser using DNS-over-HTTPS, or via a local Python RDAP backend for the most accurate results. There is no signup and no data is stored.
How accurate is the domain availability result?
It uses authoritative RDAP registry data first and cross-checks with DNS records. When a TLD has no public RDAP server and no DNS record, the result is marked unknown rather than guessed, so you are never shown a false positive.
Which TLDs does it check by default?
The default set covers about 20 popular TLDs: .com, .in, .net, .org, .io, .co, .ai, .app, .dev, .xyz, .me, .info, .biz, .us, .tech, .online, .store, .site, .cloud and .co.uk. You can enter your own list any time. .com and .in are always prioritised.
Can I use this domain checker inside Claude, ChatGPT or Gemini?
Yes. It ships an MCP server and a REST API, so you can connect it to Claude, ChatGPT, Gemini, Kimi, Cursor and any MCP client, then ask your assistant to check domain availability for you. See the connection guide.