Output
For a given IP address or domain name:

• Domain age
• Created date
• Updated date
• Expires date
• Registrant’s organization, street, city, state, postal code, country, country code, email, telephone, fax
• Administrative contact’s organization, street, city, state, postal code, country, country code, email, telephone, fax
• Technical contact’s organization, street, city, state, postal code, country, country code, email, telephone, fax
• Nameservers and hostnames
• Status
• Registrar details
• Availability
• … and more

How to use
Check our Bulk API docs for more information. You can find code examples in various programming languages on GitHub.

Benefits

• Real-time and comprehensive with over a billion active WHOIS records for both domains and subdomains across 2,864+ gTLDs and ccTLDs
• All of the WHOIS information queried in bulk is well-parsed and normalized to a consistent format for easy integration with your business processes
• Flexibility to upload multiple domain list files and getting separate Unique/Request ID for each list provided
• Easily integrable and RESTful API, compatible with all major programming languages
• The query results are returned in XML & JSON with parsed fields and raw texts

Use cases

• Cybercrime research, prevention, detection, and investigation
• Detect spam, malicious websites, intrusions, transaction fraud, and other online misbehaviors
• Establish connections between domains, websites, and IP addresses
• Check domain registration changes and availability
• Ensure reliable and secure domain name ownership transfer and management
• Protect your intellectual property and avoid potential trademark infringements by monitoring domain name similarities, duplicates, or copycats
• Learn about the competition and identify investment opportunities
• Build new business relationships using WHOIS records’ contact details

• Cyber Security researchers use Bulk Whois lookup for investigating & curbing cybercrime.
• Payment processors and banks use Bulk Whois lookup to detect transaction fraud.
• Registrars & Dominers need Bulk Whois lookup to keep track of domains.
• Brand agents use this service to protect their intellectual property and check potential trademark infringements through random searches to * reduce and eliminate domain name similarities, duplicates, or copycats.
• Law enforcement agencies depend on Bulk Whois lookup for background checks in investigations.
• Marketing Researchers use Bulk Whois lookup to research domain details either for specific brand purpose or otherwise.

These are numerous other domain research/monitoring usages across other industries.
Bulk Whois API provides Whois records for a list of Domans/IPs via a single REST API query. It is designed for server-to-server communication between your system and the WhoisXmlApi.com network using standard HTTP or HTTPS protocols. Query responses are delivered in either XML or JSON format based on your requests which are made via POST methods.
To get started you need a developer’s account with WhoisXmlApi.com. Authentication is required each time in order to use the API. The first 500 Bulk Whois API calls are complimentary when you register for a free developer account.
The main logic of using the API is the following:

1. Submit a bulk WHOIS query via a POST request
2. Retrieve your query results
   In addition, the API facilitates to get information about the status of the queries submitted under a given account.

The details are described in the User’s Guide.

You can find code exampels in various programming languages on GitHub.