As you have already learned, IPv6 addresses are allocated to companies with a prefix. The host part of the address is always 64 bits and the standard prefix is usually 48 bits or /48. This leaves 16 bits free for network administrators to use for subnetting.
Because the same rules apply to both IPv4 and IPv6, as far as network addressing is concerned, you can have only one network per network segment. You can’t break the address and use some host bits on one part of the network and some on another.
If you look at the addressing in . . .
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