Your browser
What is my user agent?
- Your user agent string
- Mozilla/5.
0 AppleWebKit/537. 36 (KHTML, like Gecko; compatible; ClaudeBot/1. 0; +claudebot@anthropic. com)
What it reports
- Browser
- Not available
- Operating system
- Not available
- Device type
- Desktop
- Rendering engine
- WebKit
Parsed from the string above. User agents are easy to spoof and intentionally vague, so this is a best-effort reading.
What is a user agent?
A user agent is a short description your browser attaches to every request in the User-Agent header. It tells the server which browser, version, operating system and rendering engine you are using, so the site can serve compatible pages and assets.
Almost every user agent still begins with “Mozilla/5.0” and name-drops engines like Safari or Gecko. Those are legacy tokens kept for backwards compatibility, not a sign that you are running those browsers.
User agent vs IP address
Your user agent describes your software: the browser and device you use. Your IP address describes your network: how you connect and roughly where you are. Both are sent with your requests, but they answer different questions and neither contains your name.
A user agent is rarely unique by itself, but together with details like your screen resolution and other browser traits it contributes to a fingerprint.
Frequently asked questions
What is a user agent?
A user agent is a line of text your browser sends in the User-Agent header with every request. It identifies the browser, its version, your operating system and the rendering engine, so a website can adapt what it serves to your setup.
What does my user agent reveal?
It reveals your browser and version, your operating system and rough device type, and the layout engine. It does not contain your name or your IP address, but it is sent to every site you visit and can be combined with other signals.
Can I change or spoof my user agent?
Yes. Browser settings, extensions and developer tools let you send a different user agent. Sites then see the value you set rather than your real browser, which is useful for testing but can break sites that rely on it.
Can my user agent be used to track me?
On its own a user agent is rarely unique, because millions of people share the same browser and OS. Combined with other details such as screen size, fonts and time zone, it becomes part of a browser fingerprint that can help identify a device.
Why does my user agent mention browsers I don’t use?
Tokens like “Mozilla”, “Safari”, “KHTML” and “like Gecko” are historical artefacts. Browsers kept them for compatibility so older servers would treat them as capable, which is why almost every user agent still starts with “Mozilla/5.0”.
Is the breakdown above always correct?
It is a best-effort reading of a messy string that can be spoofed, so treat it as a guide. Modern browsers are also deliberately reducing the detail in the user agent and moving to Client Hints, so some versions may be approximate.