The Sky Networks - CIDR CIDR (Classless Inter-Domain Routing) notation rather than the common subnet mask 255.x.x.x when configuring addresses and networks. Refer to the CIDR Subnet Table to find the CIDR
Solved Q 3) What should be the subnet mask for the network | Chegg.com
Introduction of Variable Length Subnet Mask (VLSM) - GeeksforGeeks
VLSM Design
The TCP/IP Guide - IP Subnetting Step #3: Determining The Custom Subnet Mask