Reverse DNS Lookup
This tool will provide you the hostname (ie www.yahoo.com) of the IP address that you enter below.
Results:
Lookup on IPv4 Address: 17.253.144.11
Hostname: maps.apple
Hostname: itunes.com
Hostname: platoon.fm
Hostname: pixelmator.com
Hostname: primephonic.com
Hostname: sneakysasquatch.com