Ive seen multiple devices go to different destinations and its also different by reagion. Here is the complete list of the ones that I have seen.
Kindle Fire CNA
http://spectrum.s3.amazonaws.com/kindle-wifi/wifistub.html
Google Play (aka Android Market)
android.clients.google.com - google play access
.ggpht.com - download app from google play store
Additional (these resolved IPs may not match your local environment):
android.clients.google.com - 74.125.103.138, 74.125.239.128~135, 137, 142
android.pool.ntp.org
googleusercontent.com - 74.125.239.138~140, 74.125.239.42~44
gstatic.com - 74.125.239.47
accounts.google.com - 74.125.22.84
clients1.google.com - 74.125.228.0~9,14
www.google-analytics.com - 74.125.228.32
i.ytimg.com - 74.125.239.32~41, 46
lh6.ggpht.com - 74.125.239.42~44
Amazon Market
amzdigitaldownloads.edgesuite.net