Bulk Domain Checker
Paste your list — up to 500 domains — and check availability against live registry data in one run.
Check hundreds of domains in one pass
Validating names one at a time is fine for a single idea — but if you're shortlisting brand candidates, researching a niche, or evaluating a domain portfolio, you need volume. The bulk checker takes a plain list (one domain per line), runs every entry against the authoritative registry via RDAP, and returns a sortable, filterable table: available / registered / errors, registrar, key dates, and response time per domain.
Built for real research workflows
Results stream in batch by batch, so you can start scanning availability before the full list completes. Filter to available-only, run the built-in value appraisal across all results, then export the whole table to CSV for your spreadsheet or acquisition pipeline. Registered domains include a one-click WHOIS expansion so you can see who holds them and when they expire — worth feeding into the expiry checker if you're waiting for a drop.
Where do the lists come from?
Most users paste lists from three sources: brainstorm sessions (every variation of a brand idea), the keyword generator on this site (which can produce hundreds of prefix/suffix combinations ready for bulk checking), and expired-domain or auction exports they want to re-verify against the live registry before bidding. Registry data beats any cached marketplace status — a domain marked "taken" elsewhere is sometimes already dropped.
Frequently asked questions
How many domains can I check at once?
Up to 500 domains per run. The checker processes them in batches of 50 against authoritative RDAP servers, with a live progress bar and results appearing as each batch completes.
Can I mix different extensions in one list?
Yes. Each line can carry its own TLD (example.com, example.io, example.dev). Lines without an extension get the default TLD you select from the dropdown.
Can I export the results?
Yes — one click exports everything to CSV, including status, registrar, creation and expiration dates, and estimated value if you ran the appraisal. The file is generated in your browser; your list is never stored.
Why do bulk checks take longer than single checks?
To stay respectful of registry rate limits, Namizy checks domains with controlled concurrency rather than blasting hundreds of parallel requests. A 500-domain list typically completes in under two minutes, with results streaming in as batches finish.
Is this suitable for domain investors?
Yes — bulk checking a keyword list, appraising the available ones, and exporting to CSV is the standard drop-catching research loop. Pair it with the expiry checker to monitor domains approaching their renewal date.