Sign in to C22K
List and manage your domains for sale.
Continue with Google
or
We'll send you a code and a magic link.

Bulk Domain Availability Checker

Paste up to 50 domain names — one per line — and check availability instantly.

0 / 50 domains

How It Works

Paste Your List

Enter up to 50 full domain names — any TLD supported. One domain per line.

DNS Lookup

Each domain is checked via Google DNS-over-HTTPS. NXDOMAIN means likely available; an A record means taken.

Instant Results

Results stream in as each domain is checked. Available domains sort to the top automatically. Export the full list as CSV.

Always confirm with your registrar before purchasing — DNS propagation can affect results.

Check multiple domain names in one go

Whether you're researching brand names, building a domain portfolio, or vetting a shortlist of startup names, manually checking each domain one at a time wastes hours. This free bulk domain availability checker lets you paste up to 50 names and verify all of them in a single pass using real DNS lookups and RDAP registry data.

Found a domain that's taken and want to buy it from the current owner? Browse premium domains for sale on C22K — short, memorable names with secure Escrow.com transactions.

Frequently asked questions

How many domains can I check at once?
You can check up to 50 domains per run. Paste one domain per line — any TLD is supported (.com, .io, .ai, .co, etc.).
How accurate is the availability check?
We use DNS lookup via Google DNS-over-HTTPS. NXDOMAIN means no DNS records exist, which strongly indicates the domain is available to register. Always confirm with your registrar before purchasing — propagation delays can occasionally affect results.
Does it support all TLDs?
Yes — enter the full domain name including the TLD (e.g. myapp.io, startup.ai). Any TLD that has RDAP support will get the full two-pass check.
Can I export the results?
Yes. After checking, click "Export CSV" to download a spreadsheet with all domains and their availability status.