Gip is an IP address calculator that integrates well with the GNOME desktop environment.Gip provides system administrators with tools for IP address based calculations. For example, an administrator who needs to find out which IP prefix length equals the IP netmask 255.255.240.0, just types in the mask and gets the prefix length presented. But many more advanced calculations can be made. Gip can convert an address range into a list of prefix lengths. It can also split subnets using a given IP netmask or IP prefix length. Many more calculations are possible.
Install Gip in debian
#apt-get install gip
This will complete the installation
If you want to open this application open terminal type the following command
Once it opens you should see the following screen which is IPV4 Address Analyzer
IPv4 Range Prefix Converter screen
IPv4 Subnet Calculator Screen