Guide Shows How Subnet CIDR Pro Helps Plan IPv4 Networks Offline

A DEV Community guide explains how the Subnet CIDR Pro app for iPhone and iPad can handle IPv4 subnet calculations and address planning. Using the example 192.168.1.100/26, it shows that the prefix yields 64 total addresses and 62 conventionally usable hosts, and it notes that the entered address is a host inside the subnet rather than the network address. The article compares common prefixes such as /24, /26, and /28 to show how prefix length affects capacity. It then demonstrates Variable Length Subnet Masking (VLSM) for a homelab or small office, allocating blocks from the largest host requirement downward. The author recommends leaving room for growth and verifying the proposed address boundaries before deploying them.