Who.is Developer API

Integrate lightning-fast WHOIS parsing, RDAP normalization, DNS lookup, and IP intelligence directly into your backend.

GET/api/lookup?q=domain.com&type=whois

Returns normalized registration data, registrar contacts, nameservers, status flags, and raw registry replies.

{
  "type": "whois",
  "data": {
    "domain": "example.com",
    "isRegistered": true,
    "registrar": {
      "name": "RESERVED-Internet Assigned Numbers Authority",
      "whoisServer": "whois.iana.org",
      "referralUrl": "http://res-dom.iana.org",
      "ianaId": "376"
    },
    "dates": {
      "created": "1995-08-14T04:00:00.000Z",
      "updated": "2026-08-14T08:01:43.000Z",
      "expires": "2027-08-13T04:00:00.000Z"
    },
    "nameservers": [
      { "hostname": "elliott.ns.cloudflare.com", "ipAddress": "108.162.195.228" }
    ]
  }
}

GET/api/lookup?q=domain.com&type=dns

Returns real-time resolved DNS records (A, AAAA, MX, NS, TXT, SOA, CAA) with hosting provider ASN intelligence.

POST/api/ask

Ask natural-language questions about any domain's infrastructure with AI-assisted DNS parsing.