TABLE A: Classful Address Subnet Masks and NET_ID Address Bits
Class	Subnet Mask	Number of Bits	Binary Representation
A	255.0.0.0	8	11111111 00000000 00000000 00000000
B	255.255.0.0	16	11111111 11111111 00000000 00000000
C	255.255.255.0	24	11111111 11111111 11111111 00000000