The TCP/IP Guide - IP "Supernetting": Classless Inter-Domain Routing (CIDR) Hierarchical Addressing and Notation
CIDR Classless Inter Domain Routing Give the IP address space some breathing room! Basic idea: allocate the remaining IP addresses in variable-size blocks. - ppt download
1.1 — VPC. let's talk about CIDR or CIDRs or… | by Pradeep Dhanush | Medium