IPv4 Address Calculator Lite

Simple and intuitive IPv4 address calculator (henceforth referred to as IP address for short). Given an IP address, and (optionally) a slash number / network mask, provides the network address, broadcast address, and the range of usable IP addresses (from the first to the last). Adopts the popular conventions that there are no host addresses in a /31 network (just a network address and a broadcast address, making it a degenerate network that is not very useful), and /32 refers to a single IP address.

Features include:
(a) No typing needed to specify IP addresses, subnet masks, etc. (conveniently use input methods like scroll wheel and slider)
(b) Illustrates how each IP address can be interpreted as a classful or as a classless address (showing calculations for both cases).
(c) Illustrates how the "slash notation" corresponds to the a unique network mask and a unique wildcard mask, and a specific number of usable host addresses.

Useful for:
(a) routine IP address calculations for IT professionals like network administrators and system administrators
(b) IT professionals preparing for IT certification exams like CCNA, Huawei, Comptia Network+, etc.
(c) students in computer science and/or engineering interested in computer networking and IP networking

This lite version is ad supported, and it does not distinguish IP addresses in the class A through class C range (e.g., does not point out private addresses, reserved addresses, loopback addresses, etc.).