Calculating the IPv6 Prefix (Subnet ID)
With IPv4, you can take an IP address and the associated subnet mask, and calculate the
subnet ID. With IPv6 subnetting, you can take an IPv6 address and the associated prefix
length, and calculate the IPv6 equivalent of the subnet ID: an IPv6 prefix.
Like with different IPv4 subnet masks, some IPv6 prefix lengths make for an easy math prob-
lem to find the IPv6 prefix, while some prefix lengths make the math more difficult. This
section looks at the easier cases, mainly because the size of the IPv6 address space lets us all
choose to use IPv6 prefix lengths that make the math much easier.
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