How to investigate user agent?
As an example, the user agent for IE9 is described as follows.
Mozilla / 5.0 (compatible;MSIE 9.0; Windows NT 6.1; Trident/5.0)
Application name
It corresponds to the “Mozilla” part. It is used in the sense that it has the function of the type of browser or its application.
Application Version
In the “5.0” part after Mozilla, it indicates the version of the application.
Platform token
It corresponds to the “Windows NT 6.1” part. It will be the display about OS.
Version Token
It corresponds to the part of “MISE 9.0”.Displaying browser version.
Compatibility Flags
It corresponds to the “Compatible” part. It shows the compatibility with Internet Explore.
Rendering engine
It corresponds to the part of “Trident/5.0”. Shows software that causes the browser to display the requested content.
Internet Explore
ver.11
Mozilla / 5.0 (Windows NT 6.3; ARM; Trident / 7.0; Touch; MALNJS; rv: 11.0) like Gecko
ver.10
Mozilla / 5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW 64; Trident / 6.0)
Chrome
Mozilla / 5.0 (Windows NT 5.1) AppleWebKit / 535.11 (KHTML, like Gecko) Chrome / 17.0.963.79 Safari / 535.11
Firefox
Mozilla / 5.0 (Windows NT 6.1; rv: 11.0) Gecko / 20100101 Firefox / 11.0
Safari
Mozilla / 5.0 (Macintosh; U; Intel Mac OS X; en-jp) AppleWebKit / 523.12 (KHTML, like Gecko) Version / 3.0.4 Safari / 523.12
Android
Mozilla / 5.0 (Linux; Android 4.4.2; 302KC Build / 101.0.2c00) AppleWebKit / 537.36 (KHTML, like Gecko) Version / 4.0 Chrome / 30.0.0.0 Mobile Safari / 537.36 YJApp-ANDROID jp.co.yahoo.android. ybrowser / 1.7.5
なるほど、内容よく見ると、どのブラウザか一発でわかりますね。まあ、一般的にユーザーエージェントは偽装されるのであまり意味ないかもしれませんが。そういえば、IPって偽装できるんでしょうか？？？ Chrome Extensionで、Hotspot Shieldを使えば偽装できるようですが。。
