Bulk Domain Checker - WHOIS, DNS, Email & SSL

Paste a list of domains and get one row per domain with everything you'd otherwise look up in five different tools: registrar, creation and expiry dates and how many days are left, nameservers and IP addresses, which email provider the domain uses, its SPF and DMARC records, whether the website answers and redirects to HTTPS, and when the SSL certificate runs out. Domains that aren't registered are marked as such.

I built it for audits: a client hands over a list of domains and I need to know which are about to expire, which certificates are close to the end, and which domains send email without SPF or DMARC. It's just as handy for domain portfolios, M&A checks, or cleaning up a lead list before outreach.

Example

Input:

{ "domains": ["stripe.com", "bbc.co.uk", "https://www.allbirds.com/collections", "expired.badssl.com"] }

One row (real output, Sep 29 2026):

{
  "domain": "stripe.com",
  "host": "stripe.com",
  "registered": true,
  "registrar": "SafeNames Ltd.",
  "createdAt": "1995-09-12T04:00:00Z",
  "expiresAt": "2027-09-11T04:00:00Z",
  "daysUntilExpiry": 346,
  "domainAgeYears": 31,
  "registryStatus": ["client delete prohibited", "client transfer prohibited", "server update prohibited", "..."],
  "nameservers": ["ns-1087.awsdns-07.org", "ns-1882.awsdns-43.co.uk", "ns-423.awsdns-52.com", "ns-705.awsdns-24.net"],
  "ipAddresses": ["198.202.176.161", "198.137.150.161"],
  "mx": ["10 aspmx.l.google.com.", "20 alt1.aspmx.l.google.com.", "..."],
  "emailProvider": "Google Workspace",
  "spf": "v=spf1 ip4:198.2.180.60/32 ip4:13.111.2.227/32 include:spf1.stripe.com ... ~all",
  "dmarc": "v=DMARC1; p=reject; pct=100; fo=1; rua=mailto:dmarc-reports@stripe.com; ...",
  "httpStatus": 200,
  "finalUrl": "https://stripe.com/",
  "redirectsToHttps": true,
  "sslIssuer": "DigiCert, Inc.",
  "sslExpiresAt": "2026-12-10T23:59:59+00:00",
  "sslDaysLeft": 72,
  "sslValid": true,
  "error": null
}

For expired.badssl.com the same run returned "sslValid": false, "sslError": "certificate has expired". Ten domains took about 7 seconds.

Every row has the same fields; unknown values are null.

Input

Field	What it does	Default
domains	Domains or URLs. www. is ignored; for other subdomains WHOIS is looked up for the registered domain, while DNS, website and certificate are checked on the host you entered	required
maxConcurrency	Domains checked in parallel	10
requestTimeoutSecs	How long to wait for a website	15

Good to know

• WHOIS data comes from RDAP, the official successor to WHOIS, through the registries themselves. Generic TLDs such as .com and .net and many country TLDs such as .uk are covered. A few registries, for example .de, don't offer public RDAP; for those whoisNote says so and the DNS, email and SSL checks still run.
• registered: false means the registry answered that the domain doesn't exist, which usually means it can be registered.
• emailProvider is read from MX records (Google Workspace, Microsoft 365, Zoho, Proofpoint...). If it's a provider I don't recognize, you get the MX host.
• Domains that return no WHOIS, no DNS and no website at all come back with an error and aren't charged.

Use cases

Expiry monitoring for a domain portfolio (schedule it weekly and filter daysUntilExpiry < 30), SSL renewal checks, email deliverability audits (missing SPF or DMARC), due diligence on a company's web assets, checking which names from a brainstorm are still free, and qualifying leads by email provider.

FAQ

Does it return the owner's name and email? No. Registries redact personal data under GDPR, and this Actor doesn't try to get around that. You get the registrar and dates.

What does it cost? See the Pricing tab: you pay per domain checked.

Notes

Uses public RDAP, DNS and HTTPS only. If a TLD looks wrong, open an issue with the domain.