Subnet Mask Example

IP - 159.91.15.220 Mask - 255.255.248.0

Convert to binary and remove the periods

nnnnnnnnnnnnnnnn0000111111011100

nnnnnnnnnnnnnnnn1111100000000000

and together nnnnnnnnnnnnnnnn0000100000000000

separate subnet nnnnnnnnnnnnnnnnssssshhhhhhhhhhh

So IP 159.91.15.220 with subnet mask 255.255.248.0 is in subnet #1 and is host #2012

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