Global Unicast Addresses and IPv6 Subnetting
Global unicast addresses give the world a way to give each and every IPv6 host a unique IPv6 address, without having to reuse the same addresses inside each company with something like IPv4 private addresses.
The process to give each host a global unicast address that is unique in the universe is relatively basic. As discussed earlier in the section titled “Assigning Unique IPv6 Prefixes Across the Globe,” each company can apply for and receive a unique IPv6 prefix. (This prefix comes from the range of global unicast addresses, by the way.) The prefix gives the company a block of addresses—that is, all the addresses that begin with that prefix. Then, the engineers at the company further subdivide the ...
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