A user agent is the string which describes platform, operating system and browser. User Agent is sent by the browser with other HTTP Headers to let the web server know its identity. All web browers provide a built-in User Agent string, but they can be also modified by a user.
CCBot/2.0 (https://commoncrawl.org/faq/) X-Middleton/1
Do you have a User Agent string that you want to lookup? The tool below will parse the User String, and provide you with the platform, operating system, and browser.
Enter a user-agent string:
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