An IPAddress is used to communicate over a tcp/ip network (this means one networkcard to another). It is the case if you have a network of 2 computers or if you are connected to your isp through dsl.
If you are in Class A Netowrk and a Subnetmask of 255.0.0.0 means 1 Subnet, then the Broadcast IP should be 5.255.255.255 .
If you are in Class A Netowrk and a Subnetmask of 255.0.0.0 means 1 Subnet, then the Broadcast IP should be 5.255.255.255 .