Our domain categorization engine maintains a continuously updated database of over 90 million domains, each assigned to one or more of 58 filtering categories with industry-leading accuracy through ML classification and human expert review.
Explore the DatabaseOur multi-stage classification pipeline combines automated machine learning analysis with human expert review to deliver categorization you can trust.
Our web crawlers continuously discover new domains from certificate transparency logs, DNS zone files, web spidering, and partner data feeds. Every newly registered domain is queued for classification within minutes of appearing in global DNS records.
Each domain undergoes deep content analysis including full-page rendering, text extraction, image analysis with computer vision, metadata inspection, and link graph evaluation. We examine the complete content footprint to ensure accurate classification.
Our ensemble of machine learning models processes extracted features through natural language processing, image classifiers, and behavioral analysis algorithms. The system assigns categories with accuracy scores, flagging borderline cases for human review.
A dedicated team of content analysts reviews domains flagged by the ML pipeline, validates samples from each category, and handles recategorization requests. This human layer catches edge cases that automated systems alone might miss.
Domains often span multiple content types. A news site may also contain advertising, social media integration, and streaming content. Our system assigns multiple categories when warranted, giving administrators granular control over filtering behavior.
Domain content changes over time. Our system re-crawls and re-evaluates domains on a rolling schedule, with higher-risk categories checked more frequently. Compromised legitimate domains are reclassified within minutes of detection.
Built for accuracy and speed, our classification system sets the standard for DNS-layer content filtering.
Ensemble of transformer models, convolutional neural networks, and gradient-boosted classifiers analyze text, images, metadata, and behavioral signals to determine domain categories with 99.4% accuracy.
Borderline classifications are routed to expert analysts who validate or correct the ML output. This hybrid approach combines machine speed with human judgment to handle nuanced content decisions.
Domains are assigned all relevant categories, not just a primary one. Social media platforms may carry categories for social networking, streaming media, advertising, and messaging simultaneously.
The classification database is updated continuously throughout the day. New domains are classified within minutes. Existing domains are re-evaluated on rolling schedules to detect content changes and compromises.
Administrators can submit recategorization requests through the portal or API. Requests are reviewed within 4 hours during business days, with emergency security recategorizations handled within 30 minutes.
Our NLP models support classification of domains in over 180 languages including CJK character sets, Arabic, Cyrillic, and other non-Latin scripts. Coverage extends to IDN domains and punycode encodings.
With over 90 million domains classified and growing by 250,000+ every day, our categorization database is one of the largest and most comprehensive in the web filtering industry. Coverage spans every top-level domain including new gTLDs, ccTLDs, and specialty extensions.
Unlike competitors who rely solely on automated crawlers, we augment our discovery pipeline with data from certificate transparency logs, passive DNS telemetry, domain registration feeds, and content classification partnerships. This ensures new domains are discovered and classified before they can be used for malicious purposes.
For domains not yet in our database, our real-time classification engine analyzes the domain on-the-fly during the DNS lookup, returning a category decision in under 50 milliseconds. No domain goes uncategorized.
TLDs Covered
Languages Supported
Recat Response Time
Real-Time Classify
Look up any domain and see how our engine classifies it. Try our free domain lookup tool or integrate with our API for bulk classification queries.
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