How IPv6 works
by Marshall Brain
Right now the Internet is in the process of switching over from 32-bit IP addresses to 128-bit IP addresses. The main reason for the change is the fact that the 32-bit address space is running out of IP addresses. It is assumed that a 128-bit address space will last forever. If you would like to read a good, detailed description of why and how the switch is happening, try this:
What’s IPv6…and Why Is It Gaining Ground?
This video offers a nice overview as well:
You can also check your IP address and see if it is a 32-bit address or a 128-bit address using this tool:
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