The internet realm is a matrix of numbers measured in bits. When you connect to a network it automatically assigns your device a id or IP address (Internet Protocol), which is unique to your device, kind of like a finger print. The number assigned to your device can be represented by 32-bits or 128 bits. IPv4 uses 32-bits and IPv6 uses 128. Over the years the expansion of the internet created a "paranoid" state among computer users. Computer users were worried that they would run out of IP addresses and eventually be blocked from connecting to a network. IPv6 uses 128-bits of data, allowing more users to log on at any given time. When it comes to Cyber Security, IP addresses can come in handy when trying to track down fraudulent behavior. Since every device has a unique address it makes it easier to track down who the culprit is.
http://computer.howstuffworks.com/internet/basics/question549.htm
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