Learn to Subnet
- Learn to Subnet (Charles C. Botsford)
- Chapter 4 – Subnetting (Microsoft Docs)
- IP Subnetting Made Easy: George Ou explains IP subnetting using his own graphical approach. It’s a great primer for students and a nice refresher for others. (TechRepublic.com)
- IP Addressing and Subnetting for New Users (Cisco.com)
- Understanding IP Addressing (by Chuck Semeria)
- Using /31 subnets on point-to-point links (PacketLIfe.net)
- Build Your Skills: Subnetting and supernetting IP networks
- Note: This article excludes subnet zero and the broadcast subnet for the whole address block, but we always include both in our calculations
Practice make improvement!
- SubnettingQuestions.com: Random Network, Broadcast, First, Last Addresses and Ranges
Use the calculators to check your work, not to do the work for you.