1. The default class of given address is B. The reason behind that is Class B IP Addresses range from 128.0.x.x to 191.255.x.x.
2. The subnet mask is 255.255.0.0 because the default subnet mask for Class B is 255.255.x.x.
3. The custom subnet mask is 255.255.224
4. Total number of subnets needed are 2.