Subnetting Global Unicast IPv6 Addresses Inside an Enterprise
The original IPv4 Internet design called for each organization to be assigned a classful network number, with the enterprise subdividing the network into smaller address ranges by subnetting the classful network. This same concept of subnetting carries over from IPv4 to IPv6, with the enterprise subnetting its assigned global unicast prefix into smaller prefixes.
To better understand IPv6 subnetting, you can draw on either classful or classless IPv4 addressing concepts, whichever you find most comfortable. From a classless perspective, you can view the IPv6 addresses as follows:
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