WHOIS API with RDAP Fallback

One WHOIS lookup API call returns registrar, creation and expiry dates, status and nameservers as clean JSON. When a registry supports RDAP we use it, and fall back to classic WHOIS when it does not.

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One request, normalised fields

WHOIS output differs from registry to registry. DomSDK parses it into the same JSON shape every time, so your code reads registrar, created and expires without custom parsers.

Registrar, status and nameservers
Creation, update and expiry dates
RDAP first, WHOIS fallback
Same key and credits as every other suite

Request

$ curl https://api.domsdk.com/v1/whois?domain=example.com \
  -H "Authorization: Bearer YOUR_KEY"

Response 200

{
  "domain": "example.com",
  "registrar": "Example Registrar, Inc.",
  "created": "1995-08-14",
  "expires": "2027-08-13",
  "nameservers": ["a.iana-servers.net", "b.iana-servers.net"]
}

Use it from your AI agent

The same WHOIS lookup is available as a tool on the DomSDK MCP server, so Claude, Cursor and other MCP clients can check a domain without extra code.

Set up MCP

Credit pricing

Start with 1,000 free credits a month. Plans from $4.20 a month, about 30% below DomScan list pricing.

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Try the WHOIS API free.

1,000 credits every month, no card needed.

Try it free