a convenient and efficient computing IP subnet free tools. Can adjust the mask, and therefore can be used to calculate non-standard subnet. Just enter the dotted decimal IP address, the procedure can be judged immediately it belongs to the type of address, and to demonstrate its subnet, and host, and in line with the conditions of the number of subnets, each subnet contained in the number of effective host, mask, their subnet address, subnet broadcast address (at the same time using the binary and decimal display), as well as the current subnet included in the scope of the host. Basically you want the data it has been calculated.