Public User-Agent Encyclopedia
User-Agents-X Encyclopedia is a free, open database of real
User-Agent strings collected from browsers, search engine crawlers, bots,
mobile devices, and IoT systems.
Every entry includes:
- Full User-Agent string (exact HTTP header)
- Parsed data: browser, version, OS, device, engine, CPU
- Tags:
bot, mobile, crawler, featured
- Description of the client and its typical use
Use this encyclopedia to:
• Detect bots and crawlers (Googlebot, Bingbot, Yandex, etc.)
• Study browser compatibility across versions and platforms
• Validate your User-Agent parser against real-world examples
• Build allow/block lists for security or analytics
All data is public domain (CC0) — copy, use, redistribute freely.
No registration. No API keys. No tracking.
No tracking for advertising or profiling.
We do not sell data, use cookies, or track you across the web.
Minimal anonymous usage stats help us maintain the project.
