Every request your browser sends carries a User-Agent header. Servers use it to decide which version of a site to serve, to keep crawler stats, and to tailor downloads. Here's what yours says about you right now.
Raw user-agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)- Browser
- —
- Operating system
- —
- Device type
- bot
- Bot?
- Yes
What can be inferred from a user-agent?
The string is informational — anyone can change it (browsers like Chrome and Safari ship with built-in tools to spoof it). Treat it as a hint, not a fact. Combined with other signals (TLS fingerprint, accept headers, IP), it can identify a browser with high confidence, which is why privacy-focused browsers reduce its precision.
The future: Client Hints
Modern Chromium browsers are replacing the long UA string with Client Hints — smaller, opt-in headers like Sec-CH-UA-Platform. IPFerret's parser falls back to whichever signal is present.