Learn about user agent strings - Amazon Silk
User agent string examples

Learn about user agent strings

In the user agent request header field, Amazon Silk sends one of three user agent strings, depending on the view requested on the device by the customer. If a specific view is not requested, the view defaults to Tablet for Fire tablets, and Mobile for Fire phones. If a site has compatibility issues when rendered in the default view, a different view may be selected by the device. The templates for the Amazon Silk user agents are shown below.

Tablet

Mozilla/5.0 (Linux; Android android-version; product-model Build/product-build) AppleWebKit/webkit-version (KHTML, like Gecko) 
    Silk/browser-version like Chrome/chrome-version Safari/webkit-version

Desktop

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/webkit-version (KHTML, like Gecko) 
    Silk/browser-version like Chrome/chrome-version Safari/webkit-version

Mobile

Mozilla/5.0 (Linux; Android android-version; product-model Build/product-build) AppleWebKit/webkit-version (KHTML, like Gecko) 
    Silk/browser-version like Chrome/chrome-version Mobile Safari/webkit-version
Note

Red and italics indicates variable fields, which are described below.

Template fields

  • android-version – The Android platform version (for example, 4.4.3).

  • product-model – The value of Build.MODEL (for example, KFTT).

    For a complete list of the product models, see Learn about screen resolution.

  • product-build – The value of Build.ID (for example, IML74K).

  • webkit-version – Indicates the version of WebKit used (for example, 535.19). The version can change whenever the Fire device receives a software update.

  • browser-version – Indicates the version of the Amazon Silk browser (for example, 44.1.54). The version can change whenever the Fire device receives a software update.

  • chrome-version – The version of Google Chrome with which the Amazon Silk browser is compatible.

User agent string examples

Examples of the Amazon Silk User Agent String

Tablet

Mozilla/5.0 (Linux; Android 4.4.3; KFTHWI Build/KTU84M) AppleWebKit/537.36 (KHTML, like Gecko) 
    Silk/44.1.54 like Chrome/44.0.2403.63 Safari/537.36

Desktop

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) 
    Silk/44.1.54 like Chrome/44.0.2403.63 Safari/537.36

Mobile

Mozilla/5.0 (Linux; U; Android 4.4.3; KFTHWI Build/KTU84M) AppleWebKit/537.36 (KHTML, like Gecko) 
    Silk/44.1.54 like Chrome/44.0.2403.63 Mobile Safari/537.36

UA for Kindle Fire 1st Generation

Note

The UA for the Kindle Fire 1st Generation follows a slightly different syntax.

In the examples below, red and italic text indicates variable fields. The Amazon Silk-Accelerated value can be either true or false, depending upon customer selection.

Desktop/Tablet

Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us; Silk/1.0.13.81_10003810) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16 Silk-Accelerated=true

Mobile

Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Silk/1.0.13.81_10003810) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 Silk-Accelerated=true