Submitted by thelumlaa t3_10q9h78 in explainlikeimfive
michal_hanu_la t1_j6onuon wrote
IP addresses are numbers, each 32 bits long.
A subnet of a given prefix length is a set of addresses for which the first prefix length bits are the same.
So 10.0.0.0/16 means all addresses where the first 16 bits are 00001010 (10) 00000000 (0).
If you wanted a set of addresses with the first 24 bits the same as 10.0.0.64, that would give you all addresses between 10.0.0.0 and 10.0.0.255 (inclusive), which we conventionally call 10.0.0.0/24.
But you already gave 64 of those addresses to someone, so you need to find 256 addreses all with the same first 24 bits and that is 10.0.1.0/24.
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