This app is designed to help you practicing with Classless Inter-Domain Routing (CIDR). You have to find CIDR Network, Broadcast address, CIDR Netmask, Wildcard mask, First available host, Last available host, Maximum addresses, Maximum subnets of a given IP Address. Endless series of exercises to practice with. Hone your skills if you study for both CCENT, MCSE, RHCE or CCNA exam and for school activities. It is also intended to be a teaching tool. Furthermore, it could be used with "Subnet skill", "CIDR Calc", "IP Class" and "Subnet Calc", apps by the same author. Touch and hold header address for right answers.