Problem Set 2, Answer 2: 10.0.0.0/21
This problem has a 13-bit subnet field, meaning that 213, or 8192, possible subnets exist. The following list shows some of the subnets, which should be enough to see the trends in how to find all subnet numbers:
10.0.0.0 (zero subnet)
10.0.8.0
10.0.16.0
10.0.24.0
(Skipping several subnets)
10.0.248.0
10.1.0.0 ...
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