User-Agent Online Parser

What is User-Agent?

User-Agent (UA) is a string sent by browsers or other clients with each HTTP request to identify their name, version, operating system, device model, etc. Web servers can use this to return the most appropriate page or functionality.

Why query/parse UA?

• Development & Debugging: Quickly confirm UA characteristics for different browsers or devices.
• Statistical Analysis: Analyze the distribution of browsers, systems, and devices among visitors.
• Compatibility Testing: Determine whether to load specific compatibility scripts based on UA.
• Security Protection: Identify abnormal or forged UA requests.

Example of Common UA String Structure

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

The example above includes: Mozilla/5.0 token, Windows 10 OS, 64-bit, WebKit engine, Chrome 125 browser, etc.