Website Intelligence
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99.4M+ Categorized

Instant Website
Categorization.

Classify any domain into 100+ categories instantly. Free API access with 100 requests/day rate limit.

636M+
Domains Crawled
174M+
Active Websites
99.4M+
Categorized Domains
100+
Categories
Need the full database? Download Complete Database
Step 1: Get Authorization Token
Copied!
Step 2: Categorize Domain
Copied!

* Use the token from Step 1

response.json
{
  "success": true,
  "domain": "google.com",
  "category": "Search Engines and Portals"
}
ENTERPRISE

Built for scale and reliability

SiteCategory is designed to meet the demands of modern enterprise teams – secure, scalable, and ready to integrate with your existing engineering infrastructure.

SECURE AT EVERY LEVEL

Industry-grade security

SiteCategory uses state-of-the-art security protocols and compliance standards to protect your data and intellectual property from misuse and unauthorized access.

ACROSS YOUR DEVELOPMENT STACK

Interface and vendor agnostic

SiteCategory is flexible and extensible, working with any model provider, development tooling, and interface. As your technology stack evolves, so does your categorization.

Knowledge Base

A Complete Guide to Website Categorization

Website categorization is the process of automatically classifying websites into predefined categories based on their content, purpose, and functionality. This technology has become essential for businesses, security teams, and developers who need to understand and filter web content at scale.

Modern categorization systems use advanced machine learning algorithms to analyze website content, structure, and metadata. They can classify domains into 100+ distinct categories such as Business, E-commerce, News & Media, Social Networking, Education, Healthcare, and many more. The accuracy of these systems has improved dramatically with the advent of deep learning and natural language processing technologies.

The primary use cases for website categorization include content filtering for parental controls and corporate networks, ad targeting and programmatic advertising, security policy enforcement, compliance monitoring for financial institutions, traffic analysis and competitive intelligence, and automated content moderation for social platforms.

SiteCategory.com provides one of the most comprehensive website categorization databases available, with over 636 million domains crawled and 99.4 million websites accurately categorized. Our API enables real-time categorization of any domain, making it easy to integrate into your applications and workflows.

Website Categorization for Business Apps

In today's digital landscape, understanding website content at scale is crucial for businesses across industries. Website categorization APIs enable organizations to automatically classify and filter web content, enabling powerful applications in security, marketing, and compliance.

Security teams use website categorization to enforce access policies, blocking access to malicious or inappropriate content categories. Marketing teams leverage categorization data for programmatic advertising, ensuring ads appear on relevant websites. Financial institutions use categorization for compliance monitoring, tracking which categories of websites their customers visit.

The technology behind website categorization involves crawling billions of web pages, analyzing content patterns, and using machine learning models to classify domains. The best categorization systems maintain high accuracy rates while covering millions of active websites across hundreds of distinct categories.

SiteCategory.com offers both a free API (100 requests/day) for real-time categorization and a complete downloadable database for offline use. With 174 million active websites categorized and continuously updated data, our service provides the scale and accuracy needed for enterprise applications.

API Capabilities

Free API Access

Our core API is completely free, with 100 requests per day rate limit for standard categorization requests. Perfect for development and testing.

Lightning Fast

Experience sub-50ms average API response time. Real-time categorization for your applications without delays.

Massive Database

Access to 99.4M+ categorized domains (all with categories), sourced from our crawl of 636M+ domains and 174M+ active websites.

100+ Categories

Comprehensive classification into 100+ distinct categories covering all major website types and industries.

Accurate Classification

High-accuracy categorization using advanced machine learning models trained on millions of websites.

Continuously Updated

Our API database is continuously updated with new domains and recategorizations to ensure the latest accuracy and coverage.

Easy Integration

Simple REST API that's intuitive and straightforward. Integrate in minutes with any programming language – no complex setup required.

Offline Database

Download the complete database for self-hosting. Available in CSV or SQL format as a one-time purchase.

Need to Know

Frequently Asked Questions

Website categorization is the process of automatically classifying websites into predefined categories based on their content, purpose, and functionality. SiteCategory.com provides an API that categorizes domains into 100+ distinct categories such as Business, E-commerce, News & Media, Social Networking, Education, Healthcare, and many more.

Our categorization system has categorized 99.4M+ websites with high accuracy. The system uses advanced machine learning algorithms and continuously updated data from 636M+ crawled domains to ensure reliable classification results. Accuracy varies by category but generally exceeds 90% for well-established website types.

Website categorization is used for several core purposes:

  • Content Filtering: Blocking or allowing access to specific website categories for parental controls, corporate networks, or educational institutions.
  • Ad Targeting: Programmatic advertising platforms use categorization to place ads on relevant websites.
  • Security Policies: Enforcing access policies based on website categories to protect networks from malicious content.
  • Compliance Monitoring: Financial institutions track which categories of websites their customers visit for regulatory compliance.
  • Traffic Analysis: Understanding website visitor behavior and competitive intelligence.

The API uses session-based authentication. First, generate a session token via POST /api/session, then use that token for categorization requests via POST /api/categorize with the domain in the request body. See our documentation for detailed examples in multiple programming languages.

Free API access includes 100 requests per day per session token and per IP address. For higher volume needs, consider downloading the complete database for offline use with unlimited lookups.

Yes! We offer the complete database for download in CSV or SQL format as a one-time purchase ($9,999). The database includes 99.4M+ categorized domains (all with categories), sourced from our crawl of 636M+ domains and 174M+ active websites. Visit our database page for more information.

Our API database is updated continuously with new domains and recategorizations. The downloadable database is provided as a one-time purchase, giving you access to the complete 99.4M+ categorized domains dataset at the time of purchase.

You can reach us by email at [email protected]. We're here to help with any questions about our API, database, or services.

DATA UPDATED
Live

636M+ domains crawled • 174M+ active websites • 99.4M+ categorized • 100+ categories at sitecategory.com