MCSA Windows Server 2016 Certification Guide: Exam 70-741
AWS IP Ranges for your Amazon VPC
Netmask Quick Reference Chart
IPv4 Subnet Mask Cheat Sheet - Beetle Digital
Web Technology Funda: Simply Calculate AWS Subnet's CIDR Blocks For VPC
Can someone explain the concept of /23 IP assignment while using DCHP? - Networking - Spiceworks Community
Dhcp server does not accept /23 subnet mask - Networking - Spiceworks Community
How to Calculate a CIDR
IP Calculator / IP Subnetting
What subnet mask can be used to segment the 172.16.0.0 network to allow for a minimum of 6 subnets while maximizing the number of hosts per subnet? - Quora
IP address and subnet | Blog by Raihan Al-Beruni
Which subnet does the host 172.21.5.147/23 belong to? - Quora
IP Subnetting Cheat Sheet (free PDF) for Network Engineers