That's fairly simply (although I must admit i'll never get used to that subnet stuff...)

/32, or any number actually means the number of ONEs in octet (each octet has eight ones - 11111111, which means 255 if you'll convert it from binary format to decimal, I use calc in scientific view to do that)

So following that logic 32 is 11111111.11111111.11111111.11111111 - which is 255.255.255.255 - which means host itself, so when you see 192.168.99.55/32 it means that this is the host itself.

/12 using that logic would mean the following:

12 is twelve ones - 11111111.11000000.00000000.000000000,

11111111 - gives us 255

11000000 - gives us 192 (use calc to convert it from binary to decimal format)

000000 - gives us 0

So in the end you get 255.192.0.0

Hopefully I didn't oversimplified that, if I did, then I just tried to be as fothcoming as possible ;D

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