Apply for early access to our upcoming website categorization database.

Be the first in line to obtain comprehensive website categorization intelligence with our database to be updated daily and enriched with relevant domain fields.

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231 Million+Websites parsed

4 Million+Websites parsed daily

500+Categories

52,000+Satisfied customers

Our website categorization database is…

Accurate

Our advanced AI and ML algorithms will provide confidence scores for identified website categories to guide decision-making.
Extensive

The database will cover millions of websites, be updated daily to deliver fresh insights, and be available in different formats.
Detailed

Enrich various business and security processes with additional output domain fields.

Practical usage of web categorization

Enhance Web Filtering

Implement accurate and targeted web filtering by blocking access to unsafe websites. Correlate website categories with their domain’s WHOIS creation dates and locations to detect websites possibly connected to malicious AS numbers or located in offshore countries.

Market Research and Business Insight Gathering

Determine which industries or companies are dominating in terms of online traffic in a certain region by analyzing the pertinent details of websites under a given category, including their country and AS details.

Raffaele Sommese

Researcher

University of Twente

“As part of my research into establishing resilience and security properties within the domain name infrastructure of the broader Internet, I was pleased to use the WhoisXML API Website Categorization service to identify the business categories of affected infrastructure. Integrating the APIs into my research workflow was seamless, thanks to the clear and comprehensive documentation available on their website. Within minutes, I was able to begin classifying websites and gain deeper insights into the types of businesses impacted by resilience gaps and security-related incidents.”

Sergio Diaz

Master in Cybersecurity Student

Carlos III University of Madrid

“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.”

Dennis Suermann

Student

University of Paderborn, System Security department

“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.”

Marzieh Bitaab

PhD Student, Computer Science

Arizona State University

“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.”

Fergus Smith

Software Development MST Student

University of Glasgow

“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.”

Mohammad Ismail Daud

Student

UC Davis

“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.”