Helpful tables. An IP address is a thirty-two-bit binary number Wildcard mask. The following table shows how you can create subnets, valid hosts, and broadcast addresses using the Class B subnet mask (the first eight subnets are shown, and then the last two subnets): Subnet Variable Length Subnet Mask (VLSM) Determine the subnet, usable range of host addresses, and broadcast address for a given host. In the above table is a standard Subnet Chart CIDR Subnet Mask Addresses Wildcard ////Classless