Bulk Domain Lookup

What is a bulk domain lookup?

A bulk domain lookup checks a whole list of domains in one go instead of one at a time. For each domain you get its availability status, registrar and expiry date in a single table, which you can download as a CSV file. It is built for portfolio reviews, client audits and brand checks, where looking up names individually would take far too long.

This tool accepts up to 20 domains per submission, one per line.

How the bulk domain lookup works

First, the list is cleaned: spaces are trimmed, duplicates are removed and invalid entries are set aside and listed separately, so nothing disappears without explanation. The remaining domains are then looked up through RDAP, with WHOIS as a fallback for extensions without RDAP.

Lookups run with a small, fixed number in progress at the same time. This keeps the check fast while never sending a flood of simultaneous requests to any registry, which protects both the registries and the reliability of your results.

How to use the bulk domain lookup

1. Paste your domains into the box, one per line, for example example.com on the first line and example.org on the next.
2. Press Look Up All and wait while the list is processed.
3. Read the table: domain, availability, registrar and expiry date.
4. Press Download CSV to save the results for a spreadsheet or report.

What the bulk lookup results mean

Availability

Shows whether each domain is registered, apparently available, reserved, unsupported, or could not be checked this time. "Apparently available" is a strong signal but not a guarantee; confirm at a registrar before relying on it.

Registrar and expiry

The registrar is the company managing the registration. The expiry date shows when renewal is due, which makes this a quick way to spot domains in a portfolio that need attention soon.

Skipped entries

Anything that is not a valid domain, such as a typo or a full URL with a path, is listed separately so you can correct and resubmit it.

Limits that keep the service reliable

Each submission can include up to 20 unique domains, and each connection can send a limited number of bulk submissions per minute. For larger portfolios, split the list into batches of 20 and combine the CSV files afterwards.

Preparing your domain list

The box accepts domains separated by new lines or commas, so you can paste a column straight from a spreadsheet or a comma-separated list from an email. Each entry should be a bare domain such as example.com. If the list holds more than 20 unique domains, only the first 20 are checked and the results tell you the list was shortened, so nothing is silently ignored. Keeping each batch at 20 or fewer avoids this.

Common uses

• Reviewing renewal dates across a company's domain portfolio.
• Checking which brand variations and extensions are still free.
• Auditing a new client's domains in a single pass.
• Exporting registrar data for an inventory spreadsheet.
• Finding domains spread across different registrars so they can be moved to one account.
• Checking a shortlist of possible names before a naming meeting.

Common problems and fixes

Some lines were skipped. Remove https://, paths and spaces, and make sure each line holds just one domain.

A domain shows "lookup failed". The registry did not answer in time. Check that domain again on its own a little later.

Too many requests. Wait a minute before the next batch.

Related tools

• WHOIS Lookup shows the full record for one domain.
• Domain Expiry Checker explains expiry status in detail.
• Domain Availability Checker explains each availability result.
• Bulk URL Status Checker checks whether many websites are online.

Frequently asked questions