ip - How do you calculate the prefix, network, subnet, and host numbers? - Network Engineering Stack Exchange
Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References
Subnet Masks (cont)
Tuning process of the FaceMaskNet-21 network. A set of four images... | Download Scientific Diagram
Subnet Mask Hexadecimal and Binary Conversion | VIAVI Solutions Inc.
Dan York on Twitter: "Nice cheat sheet for #IPv4 subnetting (and a good reminder that if you move to #IPv6 you don't have to worry as much about all these smaller subnets
The Emperor's Proclamations: IPv4 Subnet Masks Made Simple