TABLE A: Classful Address Subnet Masks and NET_ID Address Bits
ClassSubnet MaskNumber of BitsBinary Representation
A255.0.0.0811111111 00000000 00000000 00000000
B255.255.0.01611111111 11111111 00000000 00000000
C255.255.255.02411111111 11111111 11111111 00000000