20. CCNA Ch11 - Create a Subnet Calculator in Excel - YouTube
Subnet Calculator for IP Addresses and Subnetting ONLINE!
You are designing a subnet mask for the 172.26.0.0 network. You want 26 subnets with up to 1800 hosts on each subnet. What subnet mask should you use? - Quora
GitHub - srbrettle/VLSM-Subnet-Mask-Calculator: Android - Calculates Prefix length, Subnet Mask, and Number of IP Addresses available.