If you want to find out what user agent string your web browser is using or even if you want to spoof yourself as a major search engine so you can access online content most people can't this HTTP User Agent Identify tool will show you what your web browsers user agent is.

A user agent string is a string of text sent to web servers for the purpose of helping the web server provide you the most appropriate content. If you are attempting to visit a webpage via a mobile phone, the web page and its html code content should be different than if the visiting device is a desktop computer.

User agent strings provide info to the web server such as:

  1. The type of device you are visiting the web server with.
  2. The version of that device ...