IPv6 Addressing
When you run out of addresses, what do you do? If you're the Internet, you create a new version of IP that has a larger address space! To the average end user of the Internet, the main difference between IPv4 (the one that is standard on the Internet right now) and IPv6 is just that—more address space. While an IPv4 address has 32 bits and is written in decimal octets (172.16.10.5/24), an IPv6 address has 128 bits and is written as eight 16-bit sections (FE81:2345:6789:ABCD:EF12:3456:789A:BCDE/96).
The /xx on the end still denotes the number of bits in the subnet (which can be rather long since there are now 128 bits in the address space). Because these addresses are so long, and it will take some time to convert from IPv4 to ...
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