Subnet Calculator

I designed and created an app which allows the user to calculate an IPv4 subnet range. The user is be able to enter a IPv4 address and subnet mask. The app informs the user of what class of address the IPv4 address is and the ranges of subnets available depending on the subnet mask entered. The app displays ranges for class C IP addresses as well as class A and B IP addresses and validation for user inputs. The design is based on JSP diagrams representing the data used in the app and as well as the program logic.