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Perform bulk WHOIS lookups for up to 100 domains in a single request. Retrieve structured registration, contact, and name server data for cybersecurity analysis, brand monitoring, and domain intelligence at scale.
The Bulk WHOIS Lookup API accepts a JSON array of domain names via POST and returns an array of WHOIS objects - one per domain. Each object uses the same structure as the single-domain WHOIS Domain Lookup response.
Authorize every request with your API key, passed either as a header or as a query parameter:
X-apiKeyapiKeyThis is version 2.0 of the API.
Optional query parameter to control the response format.
formatoptionalStringdefault: jsonResponse format: 'json' (default) or 'xml'.
The request body must be a JSON object containing a domainNames array of up to 100 domain names or URLs to look up.
{
"domainNames": [
"microsoft.com"
]
}domainNamesrequiredArray<String>Array of domain names or URLs to look up. Maximum 100 items per request.
A successful request returns a 200 OK response with a JSON array containing WHOIS data for each domain. Partial successes return 206, and cached data returns 210. See the response preview on the right for the full JSON structure.
bulk_whois_responseBesides the response body, every response carries custom headers you can use to track credit usage, and concurrency usage on endpoints that enforce a concurrency limit. See the Custom Response Headers documentation and the endpoints with concurrency limits for more details.
X-Concurrent-Threadsheaderconcurrency-limited endpointsSpecifies the maximum number of concurrent requests allowed.
X-Concurrent-Threads-Activeheaderconcurrency-limited endpointsIndicates the number of active concurrent requests being processed.
X-AF-Credits-Costheaderall responsesSpecifies the number of credits consumed by the current request.
See the HTTP Status Codes documentation for a complete reference of common API errors and HTTP status codes.
Invalid domain name parameters. Please pass domain param correct value e.g. whoisfreaks.com, https://whoisfreaks.com , http://whoisfreaks.com