WHOIS Domain Lookup

Look up who registered a domain, when, and when it expires. List domains, website URLs, or email addresses, and get one flat row per domain: the registrar, the creation, update, and expiry dates, the domain age and days until expiry, the status codes, the nameservers, DNSSEC, and the registrant organization and country where the registry publishes them. Use it to age a lead list, spot domains close to expiry, find the registrar for a takedown or a purchase, or check whether a domain is registered at all.

The actor asks each registry directly. It reads the registry's public RDAP server, the structured service that replaced WHOIS, from the official IANA list of RDAP servers. Where the IANA list names no RDAP server for a TLD, the actor uses the registry's own RDAP server where one answers (.io, .ac, .co, .us, .ch, and .li, each checked on 2026-10-28), and otherwise the registry's port 43 WHOIS server (such as .de, .eu, .jp, .be, .at, and .dk). No key, no account, and no third party lookup service.

Features

• Registry sources only. RDAP from the IANA bootstrap file for 1,204 top level domains plus 6 registry RDAP servers the file does not list yet, and port 43 WHOIS through the IANA referral for the rest. The row names the source and the server that answered.
• Domain age and days until expiry, computed. Ready to filter on in Clay or a spreadsheet.
• Registrar record filled in. For .com, .net, and other registries that publish only part of the record, the actor also reads the registrar's own RDAP record for the abuse email and any registrant organization or country the registrar publishes.
• Any input shape. stripe.com, https://blog.stripe.com/x, and jane@stripe.com all look up stripe.com. A domain listed twice is looked up and charged once.
• Not registered is an answer. A domain the registry says it does not hold returns registered false.
• You pay for answers only. A row is charged only when the registry returned the dates or said the domain is not registered. A row with no dates published, an error row, and input that is not a domain are free.
• Polite to registries. At most two requests in flight per RDAP server and one query at a time per WHOIS server, with retries on rate limits.

Input

Field	Type	Default	What it does
domains	array		Domains, URLs, or email addresses, 1 to 5,000 per run
domain	string		One domain, for a Clay column with one domain per row. Added to domains
follow_registrar_rdap	string, true or false	true	Also read the registrar's RDAP record where the registry links one
include_raw	string, true or false	false	Put the registry's RDAP JSON or WHOIS text in raw_response
max_charge_usd	string		Stop before a charge that would pass this amount

Every input accepts a string, which is what Clay sends.

Output

One row per domain. Every row has the same columns.

Field	Type	Meaning
input	string	The entry as you gave it: a domain, URL, or email address.
domain	string	The registrable domain looked up, lowercase. Subdomains and www are dropped. Empty when the input is not a domain.
tld	string	The top level domain.
registered	boolean	true: the registry holds a record for this domain. false: the registry answered that it is not registered. Empty on an error row.
registrar_name	string	The registrar of record, as the registry or registrar publishes it.
registrar_iana_id	string	The registrar's IANA ID, where published (gTLDs and some ccTLDs).
registrar_url	string	The registrar's website, where published.
registrar_abuse_email	string	The registrar's abuse contact address, where published.
created_at	string	Registration date, UTC ISO 8601.
updated_at	string	Date the registry record last changed, UTC ISO 8601.
expires_at	string	Expiry date, UTC ISO 8601.
domain_age_days	integer	Whole days from the creation date to the time of the run.
days_until_expiry	integer	Whole days from the time of the run to the expiry date. Negative when the expiry date has passed (the domain may be in its grace period).
status	array	The domain status codes as the registry publishes them, for example client transfer prohibited, redemption period, or pending delete.
nameservers	array	The delegated nameservers, lowercase.
dnssec	boolean	true when the delegation is signed, false when it is not, empty when the registry does not say.
registrant_organization	string	The registrant organization, only when the registry or registrar publishes it. Most gTLD records are redacted for privacy, so this is often empty.
registrant_country	string	The registrant's two letter country code, only when published.
source	string	rdap: the registry's RDAP server. whois: the registry's port 43 WHOIS server, used where the registry has no RDAP server or its RDAP server failed.
source_server	string	The registry server that answered.
registrar_rdap_status	string	followed: the registrar's own RDAP record was read and filled gaps. not_offered: the registry names no registrar record. unreachable: the registrar record did not answer. off: the option is off. Empty for WHOIS rows.
raw_response	string	With Include the raw registry answer on: the RDAP JSON or the WHOIS text, up to 50,000 characters. Empty otherwise.
row_status	string	ok: the registry answered with the dates, or answered that the domain is not registered (charged). partial: the registry answered but publishes no creation or expiry date, as the .de and .eu registries do over WHOIS (free). error: no answer, or the input is not a domain (free).
error_reason	string	Why a row is partial or error, for example invalid_domain, whois_rate_limited, or input_invalid for input the run could not use.
billable_events_json	string	What this row was billed as, for example {"domain-lookup":1}. {} means free.
checked_at	string	When the row was written, UTC.

Example row:

{
  "input": "https://www.notion.io/pricing",
  "domain": "notion.io",
  "tld": "io",
  "registered": true,
  "registrar_name": "Gandi SAS",
  "registrar_iana_id": "81",
  "registrar_url": "https://www.gandi.net",
  "registrar_abuse_email": "abuse@support.gandi.net",
  "created_at": "2012-05-21T04:24:08.000Z",
  "updated_at": "2026-09-10T01:50:39.000Z",
  "expires_at": "2027-05-21T04:24:08.000Z",
  "domain_age_days": 5273,
  "days_until_expiry": 205,
  "status": [
    "clientTransferProhibited"
  ],
  "nameservers": [
    "ns-1812.awsdns-34.co.uk",
    "ns-685.awsdns-21.net"
  ],
  "dnssec": false,
  "registrant_organization": "SOCIETE EDITRICE DU MONDE",
  "registrant_country": "FR",
  "source": "rdap",
  "source_server": "rdap.verisign.com",
  "registrar_rdap_status": "followed",
  "raw_response": null,
  "row_status": "ok",
  "error_reason": null,
  "billable_events_json": "{\"domain-lookup\":1}",
  "checked_at": "2026-10-28T14:00:00.000Z"
}

The run also writes a RUN_SUMMARY record to its key-value store with counts per row status and per source, the requests made, and the charges.

Pricing

Pay per event. You pay for domain lookups and the run start.

Event	Free plan	Bronze	Silver	Gold
domain-lookup, one domain the registry answered for	$0.0025	$0.002375	$0.00225	$0.002125
apify-actor-start, once per run (one per GB of memory; the default 128 MB is one)	$0.0006	$0.0006	$0.0006	$0.0006

Per 1,000 domain lookups: $2.50 on the free plan, $2.13 on Gold.

Free rows: a domain whose registry publishes no creation or expiry date (partial), an error row, input that is not a domain, and a repeat of a domain in the same run. A run whose input is refused writes one free row and charges only the run start.

Free plan cap: 1.50 USD of evaluation a month, about 600 domain lookups. Any paid Apify plan removes the cap, and it resets on the 1st. The run stops before a charge that passes your maximum charge per run in Apify or your max_charge_usd.

Mamba Labs pays the platform costs of your run. The registries' RDAP and WHOIS services are free and need no key.

Usage examples

Apify Console or API. Paste your domains and start the run. Read the rows with GET https://api.apify.com/v2/datasets/{datasetId}/items.

{
  "domains": ["stripe.com", "notion.io", "lemonde.fr"]
}

Clay. Add an Apify column, pick this actor, and map your domain or website column to domain. Filter on row_status first, then on domain_age_days or days_until_expiry.

MCP. The Mamba Labs MCP server @mambalabsdev/mcp-whois-domain-lookup exposes the tool lookup_domain_whois to Claude and other MCP clients.

Error handling

Case	What you get
No domains, an empty list, a wrong type, or more than 5,000 domains	One free row, row_status error, error_reason starting input_invalid:, and the run ends successfully. Only the run start is charged
An entry that is not a domain (an IP address, a bare TLD, text)	A free row, error_reason invalid_domain
The registry says the domain is not registered	A charged row, registered false
The registry answers but publishes no dates (.de and .eu over WHOIS)	A free row, row_status partial, with the status and nameservers it did publish
The RDAP server fails or times out	The actor asks the registry's WHOIS server instead; if that fails too, a free error row names both
A WHOIS server drops the connection	One retry 3 seconds later, then a free error row
A WHOIS server refuses more queries	A free row, error_reason whois_rate_limited; rerun those domains later
The run nears its timeout	It stops starting new domains 90 seconds before the timeout, writes the rest as free not_started rows, and ends successfully

Limitations

• Most .com, .net, and new gTLD records redact the registrant for privacy, so registrant_organization is often empty. The actor never guesses it.
• Some registries publish less than others. DENIC (.de) publishes status, nameservers, and the last change date over WHOIS, and EURid (.eu) publishes the registrar and nameservers; neither publishes creation or expiry dates there, so those rows are partial and free.
• Some ccTLD registries publish no WHOIS or RDAP for automated use, or answer only listed addresses (for example .es). Those rows are free errors. A WHOIS server that drops a connection is retried once.
• WHOIS text formats differ by registry. Fields a registry prints in an unusual format can be empty; include_raw returns the text so you can read it yourself.
• Dates are the registry's own. A domain past its expiry date can still show registered true during the registry's grace period.

Mamba Labs actor suite

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LinkedIn Post Tracker	oiGLNPuaf5BRaz9K5
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MCP servers for the suite are published under the npm scope @mambalabsdev.

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