Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.
Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.
Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.
Access our web-based solution to dig into and monitor all domain events of interest.
Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.
Detect and block access to and from dangerous domain names before malicious actors can weaponize them. Contact us today for more information.
Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.
Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.
Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.
Enjoy priority data access with our premium API services topped with extra perks including dedicated team support, enterprise-grade infrastructure, and SLAs for full scalability and high performance.
Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.
Learn MoreLeverage accurate and up-to-date web categorization data obtained via modern web classification techniques like NLP and ML for more effective, faster, and data-driven cybersecurity, marketing, and business decisions.
Get started100 free API requests. No credit card required.
A confidence score and available categories are provided for each queried domain or URL. Output also includes the domain's WHOIS record creation date and Autonomous System data.
Our tools perform live queries, so the data you receive is fresh and relevant.
Save time and resources with well-parsed and easy-to-integrate API outputs in JSON format.
Filter and block access to prohibited websites at work to boost employee productivity and comply with web usage policies using Website Categorization API. Supplement parental control systems by blocking specific web content or safelisting kid-friendly websites.
Monitor and analyze user access logs and browsing behaviors across endpoints and determine frequently visited websites to gain in-depth insights when formulating endpoint security strategies.
Use precise website categorization to support online advertising strategies and business-to-business (B2B) marketing contact enrichment and segmentation.
Apply for early access to our website categorization database.
Apply for Early Access“WhoisXML API’s Website Categorization API helped me save time. If I did not use it, I would still be categorizing domains manually. It also improved the study’s accuracy, as the API had well-defined categories, and the output is precise and relevant.”
“The website intelligence is easy to set up and returns everything we need. One reason for this is the documentation of the API, which is well-written and very detailed.”
“Thanks to well-structured and clear API documentation provided by WhoisXML API, we were able to integrate the solution seamlessly into our system with minimal technical challenges.”
“With other APIs, there’s a tendency for requests to fail. But I didn’t notice that with Website Categorization API. I noticed that whenever a request was made, the website was always categorized.”
“I used WHOIS API and Website Categorization API. Both tools are simple and straightforward to use. Some API providers have extra bells and whistles that they force you to use, but WhoisXML API is really easy to work with. It’s stable, and I can trust that it’s not going to flatline later.”
Our APIs are available in an enhanced version that offers better performance with a dedicated load balancer and a premium endpoint to enable faster throttling for large-scale API deployments.
Learn moreTired of constantly renewing subscriptions? Get a year’s worth of API access. The amount you pay depends on the desired query volume that matches your business requirements.
Learn moreGet free access to our API. 100 free credits monthly. No credit card required.
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