IPv4v6 CIDR Calculator is a networking utility app offered by Techablr Apps for Android devices. This free app provides an easy-to-use CIDR (Classless Inter-Domain Routing) calculator that computes various network-related values for given IPv4 or IPv6 address and prefix length. With the help of a slider, users can select the prefix length and the app will calculate the following for the given address: Network Address, Broadcast Address, Netmask, Hostmask, Number of Hosts, Host Range Start, and Host Range End.

One of the best features of this app is that it allows users to change the color of the text and background, including Dark Mode. This makes it more comfortable to use, especially in low light conditions. Overall, IPv4v6 CIDR Calculator is a useful tool for network professionals, IT students, or anyone who needs to calculate CIDR subnets on IPv4 or IPv6 addresses.