Subnetting - Calculate Subnet Masks & More | Pluralsight
IP Subnet Mask Quick Cheat Sheet | Ask The Admin
IP Routing on Subnets
Gip – IP calculator for GNOME desktop environment | Ubuntu Geek
The TCP/IP Guide - IP Subnetting Step #3: Determining The Custom Subnet Mask
How do you calculate the prefix, network, subnet, and host numbers? - Network Engineering Stack Exchange
Knowing the IP address and subnet mask can calculate the network address, broadcast address, address range, host digits, available host digits - Programmer Sought