Finding the IPv6 Prefix
In IPv6, a prefix represents a group of IPv6 addresses. For now, this section focuses on
the math, and only the math, for finding the number that represents that prefix. Chapter
23, “IPv6 Addressing and Subnetting,” then starts putting more meaning behind the actual
numbers.
Each IPv6 prefix, or subnet if you prefer, has a number that represents the group. Per the
IPv6 RFCs, the number itself is also called the prefix, but many people just call it a subnet
number or subnet ID, using the same terms as IPv4.
As with IPv4, you can start with an IPv6 address and prefix length, and find the prefix, with
the same general rules that you use in IPv4. If the prefix length is /P, use these rules:
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