If you’re a site owner, you may want to know accesses from Kindle to your site (i.e. to provide simplified version). The
User-Agent for Kindle 4 Touch with latest firmware (in time of writing this post -
Kindle 5.0.0 (1370280073)) is:
Mozilla/5.0 (X11; U; Linux armv7l like Android; en-us) AppleWebKit/531.2+ (KHTML, like Gecko) Version/5.0 Safari/533.2+ Kindle/3.0+
Probably the interesting piece is
Kindle/3.0+, so you can distinguish previous Kindle 3.