subnet - Subnetting how many networks can be contained -

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OK, I have a submitted question, I know the answer, but I do not know why this is the correct answer :

How many / 16 networks can be included in the A / 8 network? Answer 2 ^ (8), but why? Any help is appreciated :)

An IPv4 address is 32 bit if the network takes 8 bits , Then it leaves 24 bits for the subnet and address. Your subnet size is 16 bits (for the host) that leaves 8 bits for the number of subnet, this is the reason for this subnet number of 2 ^ 8 And for the number of addresses is 2 ^ 16. 

  11111111.11111111.00000000.00000000 Network - Subnet - Addresses ------- -

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