VLSM Calculator is an Android-based utility and tool program developed by Gaak. It is a full version program that provides an efficient way to expand the capacity of hosts and use one assigned IP address. This program is beneficial for networking students as well as network administrators who are working towards their certifications such as CCNA, CCDA, CCNP, and CCIE.

VLSM Calculator uses IPv4 subnets in order to expand the capacity of hosts and efficiently use one assigned IP. This program provides a more efficient use of address space in networks that have many unassigned IP addresses. VLSM Calculator is available in English and Spanish and does not require any additional special permissions or internet connection. Additionally, there are no ads when using the program. VLSM Calculator is the number one best-selling app in many Google Play countries.