Step 3: Determine which bits in the address contain network information and which contain host
information.
1. Draw the Major Divide (M.D.) as a wavy line where the 1s in the major network mask end (also
the mask if there was no subnetting). In our example, the major network mask is 255.255.0.0, or
the first 16 left-most bits.
2. Draw the Subnet Divide (S.D.) as a straight line where the 1s in the given subnet mask end. The
network information ends where the 1s in the mask end.
3. The result is the Number of Subnet Bits, which can be determined by simply counting the number
of bits between the M.D. and S.D., which in this case is 10 bits.