IPv6 Subnetting Using Global Unicast Addresses
Global Unicast
After an enterprise has a block of reserved global unicast addresses—in other words, a global routing prefix—the company needs to subdivide that large address block into subnets.
Subnetting IPv6 addresses works generally like IPv4, but with mostly simpler math (hoorah!). Because of the absolutely large number of addresses available, most everyone uses the easiest possible IPv6 prefix length: /64. Using /64 as the prefix length for all subnets makes the IPv6 subnetting math just as easy as using a /24 mask for all IPv4 subnets. Additionally, the dynamic IPv6 address assignment process ...
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