By whoisapi
Updated 9 months ago
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WHOIS v2 API Overview

Advanced WHOIS queries and more. Version 2 of our popular WHOIS API. Returns well-parsed WHOIS fields in XML and JSON formats. Use it to track domain registrations, check domain name availability, detect credit card fraud, locate users geographically. The service automatically follows the whois registry referral chains until it finds the correct whois registrars with the most complete whois data. Works over basic HTTP and avoices firewall-related problems of accessing Whois servers on port 43.

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WHOIS records

  • Our Hosted Whois Web Service provides the registration details, also known as the Whois Record, of a domain name or an IP address.
  • The first 500 Whois API calls are complimentary when you register for a free developer account.


  • Get key data points for domains including Registrant name, organization, e-mail address, registration address, registrar information, creation date, expiration date, updated date, domain availability, domain age, and much more.
  • All the WHOIS information is well parsed and normalized to a consistent format for easy integration with your business processes.
  • The query results with both parsed fields and raw texts are returned in popular XML & JSON format.
  • Real-time WHOIS data, ensuring that only the most up to date and accurate information is available.

Practical uses

  • Cyber Security researchers use WHOIS API for investigating & curbing cybercrime.
  • Cyber Security and anti-malware solutions use WHOIS API to detect spam, malicious websites, intrusions, and other online misbehaviors.
  • Payment processors and banks use WHOIS API to detect transaction fraud.
  • Domainers use WHOIS API to check domain names availability and to track domain registration changes.
  • Registries, registrars and domain brokers use WHOIS API to ensure reliable and secure domain name ownership transfer and management.
  • Brand agents use WHOIS data to protect their intellectual property and to check potential trademark infringements. They also use WHOIS searches to scope domain name similarities, duplicates, or copycats.
  • Domain investors use the information gained from WHOIS searches to learn about their competition and to identify investment opportunities.
  • Law enforcement agencies use WHOIS API to identify all the connected domains, websites and IP addresses associated with fraudulent activities and criminals.
  • Website owners and managers use WHOIS API to identify new business and partnership opportunities and to locate potential buyers through the contact details provided in the WHOIS records.

Additional support, sample codes, etc.

Additional documentation and support is provided on the webpage of the API.

Examples of use in popular programming languages are provided in our GitHub repository.

Install SDK for (Node.js)Unirest

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