Available Subnet – 140.168.0.0/16

Required Hosts – 400

Network ranges

Subnet ID                                 Broadcast Address

140.168.0.0——————  140.168.1.255

140.168.2.0——————  140.168.3.255

140.168.4.0—————–   140.168.5.255

140.168.6.0—————–   140.168.7.255  and so on