Most of the time, I see IPv6 prefixes as /64, but once in a while some configurations show /48. I understand that this prefix is essentially telling you that the first 64 bits are the network portion of the IPv6 address. When you see /48 prefix, is this just telling you the network portion of the address without incorporating the subnet into it? When you see a /64 prefix, is this there not subnet included in that network portion, and with a /48 prefix, can you assume that there are multiple subnets for that network?
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