Domain WHOIS, DNS & Email Provider Lookup

Paste a list of domains (or website URLs) and get one clean row per domain with:

• Registration (RDAP, the modern WHOIS): registrar, creation date, expiry date, last update, domain age in days, days until expiry, status flags, nameservers, DNSSEC
• DNS: A and AAAA records, whether the domain resolves, MX records
• Email provider: detected from MX (Google Workspace, Microsoft 365, Zoho, Proofpoint, Mimecast, GoDaddy, Namecheap, Fastmail and 20+ more)
• Email security: SPF record, ~all/-all policy, senders allowed by SPF (SendGrid, Mailchimp, HubSpot, Amazon SES...), DMARC record and policy (none / quarantine / reject)
• Verified SaaS tools: services the domain verified via DNS TXT records (Google Search Console, Meta, Atlassian, Slack, Stripe, DocuSign, OpenAI and more)

No browser, no proxies, no logins: it uses public RDAP registry servers (via the IANA bootstrap list) and DNS-over-HTTPS, so it is fast and cheap.

Use cases

• Lead qualification and segmentation: split a prospect list by email provider (Google Workspace vs Microsoft 365) or by the tools they use
• Cold email hygiene: drop domains with no MX records before you send
• Deliverability and security audits: find domains with no SPF or a DMARC policy of none
• Domain portfolio monitoring: expiry dates and registrars across hundreds of domains
• Market research: how many companies in a list use a given provider

Input

Field	Description
domains	List of domains or URLs (https://www.example.com/page becomes example.com)
domainsText	Optional: paste a list separated by new lines, commas or spaces
includeRegistration	RDAP registration data (default on)
includeRawTxt	Also return all raw TXT records
maxDomains	Safety cap

Output example (shortened)

{
  "domain": "stripe.com",
  "registrar": "SafeNames Ltd.",
  "registeredAt": "1995-09-12T04:00:00Z",
  "expiresAt": "2027-09-11T04:00:00Z",
  "domainAgeDays": 11352,
  "nameservers": ["ns-1087.awsdns-07.org", "..."],
  "resolves": true,
  "mxRecords": [{ "priority": 10, "host": "aspmx.l.google.com" }],
  "emailProvider": "Google Workspace",
  "hasSpf": true,
  "spfAll": "~all",
  "hasDmarc": true,
  "dmarcPolicy": "reject",
  "verifiedServices": ["Microsoft 365", "Atlassian", "Google Search Console", "OpenAI"]
}

Notes

• No personal data. The actor never returns registrant names, emails, phones or addresses, only registry-level data about the domain.
• Some country-code TLDs (for example .de) do not publish RDAP. For those, rdapError explains why and the DNS and email fields are still filled.
• Email provider detection is based on MX hostnames. Domains behind a security gateway (Proofpoint, Mimecast) show the gateway, since the mailbox host is not public.
• Results reflect live DNS at run time.

Questions or a missing provider?

Open an issue in the Issues tab and I'll add it.

Pricing

Pay per result: $2.50 per 1,000 domains, plus $0.00005 per run start. No monthly rental. A domain that cannot be resolved still returns one row and counts as one result.

FAQ

How do I find which email provider a company uses?

Paste the domains. The Actor reads MX and SPF records and labels the provider (Google Workspace, Microsoft 365, Zoho and others) for each one.

Can I do a bulk WHOIS lookup?

Yes. Registration data comes from RDAP (the modern WHOIS) with registrar, creation and expiry dates, for thousands of domains in one run.

Can I check SPF and DMARC records in bulk?

Yes. Each row includes the SPF record and senders it authorizes, plus the DMARC policy (none, quarantine or reject).

Is this useful for lead generation?

Teams use it to segment lead lists by email provider, find companies using a given SaaS (from verification TXT records) and spot domains about to expire.