Subnetting ( Cont. )

Formula to identify Network & Broadcast Address.

• Network Address = Host No. * (segment - 1)
  
• Broadcast Address = Network Address + (host no. - 1)

eg. Identify Network & Broadcast Address for this subnet 255.255.255.1111 0000

Host No. = 2^4 = 16 host

Network Address at subnet 10
NA = Host No. * (segment -1)
= 16 * (10-1)
= 16 * 9 = 144
NA = 192.168.1.144

Broadcast Add, BA = NA + (Host No. - 1)
= 144 + (16 - 1)
= 144 + 15 = 159
BA = 192.168.1.159