Net D : 151 hosts   Assign subnet ID = 67
Network : 172.16.0.0 / 16
                10101100.00010000.00000000.00000000
 
(host bits= 8 and 16 – 8 = 8 bits used for subnet id)
 
10101100.00010000.00000000.00000001   Minimum Host ID
10101100.00010000.00000000.11111110   Maximum Host ID
 
10101100.00010000.01000011.00000001   Subnet ID = 67, Host = 1
10101100.00010000.01000011.11111110   Subnet ID = 67, Host = 254

172.16.67.1 – 254 / 24  Subnet Mask = 255.255.255.0

Net E  : 445 hosts   Assign subnet ID = 9
Network : 172.16.0.0 / 16
                10101100.00010000.00000000.00000000

(host bits= 9 and 16 – 9 = 7 bits used for subnet id)
 
10101100.00010000.00000000.00000001   Minimum Host ID
10101100.00010000.00000001.11111110   Maximum Host ID
 
10101100.00010000.00010010.00000001   Subnet ID = 9, Host = 1
10101100.00010000.00010011.11111110   Subnet ID = 9, Host = 510

172.16.67.1 – 254 / 23  Subnet Mask = 255.255.254.0

Net F : 325 hosts      Assign subnet ID = 72
Network : 172.16.0.0 / 16
                10101100.00010000.00000000.00000000

(host bits= 9 and 16 – 9 = 7 bits used for subnet id)
 
10101100.00010000.00000000.00000001   Minimum Host ID
10101100.00010000.00000001.11111110   Maximum Host ID
 
10101100.00010000.10010000.00000001   Subnet ID = 72, Host = 1
10101100.00010000.10010001.11111110   Subnet ID = 72, Host = 510

172.16.67.1 – 254 / 23  Subnet Mask = 255.255.254.0