Bulk Domain Availability Checker
Paste up to 100 domains and check availability, registrar details, dates, and the cheapest registration price per TLD — all at once. Powered by RDAP, no sign-up required.
One per line, or separated by commas, semicolons, tabs, or spaces. URLs like https://www.example.com/ are normalized automatically.
How bulk domain checking works
This tool queries the RDAP (Registration Data Access Protocol) servers operated by each registry to determine whether a domain is currently registered. RDAP is the modern, standardized replacement for traditional WHOIS, and it returns structured JSON we can parse instantly.
For each registered domain we extract the registrar, registration date, and expiry date. For every TLD in your list we also look up the cheapest registration price from our continuously updated price database, including renewal cost and a 5-year total of ownership.
Lookups run with a small concurrency limit so we don't hammer upstream RDAP servers. You can paste up to 100 domains in a single batch. Need to dig deeper into one result? Click Compare next to any row to jump straight to the full single-domain search.
Frequently Asked Questions
How many domains can I check at once?
Up to 100 valid domains per batch. Larger lists can be split into multiple batches.
Is the data live?
Yes. Every result comes from a live RDAP query against the relevant registry. Pricing data is updated regularly from registrar feeds.
Why are some domains marked as Error?
Some registries rate-limit or temporarily reject RDAP queries, and a few less-common TLDs do not yet expose RDAP endpoints. Re-running the batch usually resolves transient errors.
Are my pasted domains stored anywhere?
No. Domains are processed in your browser and sent to the lookup API request-by-request. Nothing is logged or persisted.