Bulk WHOIS lookup: RDAP records for a whole list of domains
A bulk WHOIS lookup returns the public registration record for many domains at once. Paste domains or upload a CSV, and each is looked up over RDAP, the modern replacement for WHOIS, on its registry's own server. You get registrar, created, updated and expiry dates, status codes, nameservers and DNSSEC in one table, with CSV export.
Sample result
acme.example was registered in August 1995 and expires in August 2027.
- Domain
- acme.example
- Created
- 14 Aug 1995
- Expires
- 13 Aug 2027
What this means for you
See who registered each domain and when it lapses, in one table you can download.
- Registrar, created, updated and expiry dates
- EPP status codes, nameservers and DNSSEC
- Up to 500 unique domains a run
- Download the whole table as CSV
- WHOIS
- Bulk
- RDAP
By SimpleVerifier Team · Last updated
How do I look up WHOIS records for a list of domains?
- Paste domains, email addresses or website URLs, one per line, or upload a CSV of up to 5,000 rows and 500 unique domains. Addresses and URLs are trimmed to the registered domain.
- Press Look up WHOIS records. Only the unique domains are sent, 20 at a time, and each is looked up on its TLD registry's RDAP server.
- Read the table: registrar, created, updated and expiry dates, status codes, nameservers and DNSSEC. Filter by result to find the rows that need a closer look.
- Download everything as CSV. For a TLD without RDAP, use the registry's own WHOIS server, linked from the single WHOIS lookup.
Example
- You enter
- A pasted list or CSV containing
acme.example. - You get
- Record found: created 14 August 1995, expires 13 August 2027, registrar Example Registrar, Inc., status client delete and transfer prohibited, DNSSEC signed. TLDs without RDAP return no record. Download the whole table as CSV.
- Limits
- Up to 5,000 rows and 500 unique domains a run, and 1,000 domains per ten minutes per connection, shared with the bulk age and expiry checkers. Some visitors without an account get the first 25 rows and sign in for the rest.
How do I do a bulk WHOIS lookup?
Put the list above and press Look up WHOIS records. For each domain, the tool finds the registry for its top-level domain in IANA's RDAP bootstrap file, as RFC 9224 describes, and reads the domain's record from that registry. Lookups run five at a time, 20 domains per request, up to 500 unique domains per run.
The table shows the registry's view of each name: the sponsoring registrar, registration, last-changed and expiration events, EPP status codes, the delegated nameservers and whether the delegation is DNSSEC-signed. Contact details aren't listed here; most are redacted anyway. For one domain with the registrar's abuse contact and any published contacts, use the WHOIS lookup.
Is RDAP the same as WHOIS?
RDAP (Registration Data Access Protocol) is the modern WHOIS: the same registration data, served as structured JSON over HTTPS instead of free-form text over port 43. It's defined in RFC 9082 and RFC 9083, and every field has a fixed name, so a bulk lookup doesn't have to guess how each registry formats its output.
ICANN requires all generic-TLD registries and registrars to run RDAP, and since 28 January 2025 no longer requires them to run WHOIS. Country-code TLDs set their own rules, and that's where the gaps are.
Which TLDs don't have RDAP?
When we checked IANA's bootstrap file on 19 October 2026, these country-code TLDs had no RDAP service listed: .io, .co, .me, .de, .us, .eu, .it, .es, .ch, .jp, .cn and .ru, among others. Rows on those TLDs show "TLD has no RDAP", plus whether the domain has nameservers in DNS, which proves it's registered. The registry's own WHOIS server is listed on IANA's root zone database page for each TLD.
Generic TLDs such as .com, .net, .org, .app and .dev all publish RDAP, as do many country codes, including .uk, .fr, .nl, .ca, .au and .ai. The list changes as registries add RDAP, so the tool reads IANA's file fresh each day rather than keeping its own.
Is this better than running whois from the command line?
| This tool | whois command per domain | |
|---|---|---|
| Domains per run | Up to 500 | One at a time, or a script |
| Output format | One table with fixed columns | Free text that differs by registry |
| Finding the right server | From IANA's RDAP bootstrap file | The client's built-in list, or a guess |
| TLDs without RDAP | Shown as no RDAP | Covered where the registry runs WHOIS |
Who uses this tool, and for what?
- Agencies
- Audit every client domain in one table: who the registrar is, when each expires, whether it's transfer-locked and whether DNSSEC is on.
- Cold emailers
- Check a batch of sending domains for the right nameservers and registrar after setup, and spot any with a hold status before warm-up.
- Security teams
- Review lookalike or suspicious domains in bulk: creation dates, registrars and nameservers often show which ones were set up together.
- Sales ops
- Add registration data to an account list to spot very new domains, or ones with no nameservers, before outreach.
What can’t this tool tell you?
- TLDs without RDAP, including .io, .co, .me, .de and .eu, return no record here. Their registries' WHOIS servers are listed on IANA's site.
- The table shows the registry's record. Registrar-only data, such as contacts on thin registries, isn't fetched in bulk.
- Fields a registry leaves out show as a dash; we can't promise any registry publishes every field or answers every lookup.
- Up to 500 unique domains per run, and 1,000 per ten minutes from one connection, shared with the bulk domain age and expiry checkers.
- A registration record says who holds a domain, not whether any mailbox on it is real.
Common questions
- Can I do a WHOIS lookup for multiple domains at once?
- Yes. Paste up to 5,000 rows or upload a CSV, and up to 500 unique domains are looked up per run over RDAP. The table shows registrar, dates, status codes, nameservers and DNSSEC, and downloads as CSV.
- Is this bulk WHOIS lookup free?
- Yes, it's a free tool with no card or payment. Short lists run without an account; for longer lists you may be asked to sign in with Google first, which is free too. One connection can look up 1,000 domains per ten minutes.
- What is the difference between WHOIS and RDAP?
- They hold the same registration data. WHOIS returns free-form text that differs by registry; RDAP returns structured JSON over HTTPS with standard field names, and supports access controls. ICANN now requires RDAP for generic TLDs and no longer requires WHOIS.
- Why doesn't the lookup show the domain owner?
- Most registrars redact registrant names and addresses for privacy, so the record usually names only the registrar. This bulk tool leaves contacts out; the single WHOIS lookup shows what a registry or registrar does publish, including the abuse contact.
- What do status codes like clientTransferProhibited mean?
- They're EPP status codes set by the registrar or registry. clientTransferProhibited is a transfer lock, a normal safety setting; serverHold or pendingDelete mean the name isn't working or is on its way out. ICANN's EPP status codes page explains each one.
Sources
You audited one domain. Cold outreach means thousands.
This tool checks a domain you type in. It will not tell you which addresses at that domain are real.
- Bulk mailbox verification with real SMTP checks
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One plan, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.