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
Learning Subnetting Part 5 - Find the Networks /17, /18, /25, /26, /27 - YouTube
First attempt Subnetting! Help please!
Finding Network ID of a Subnet (using Subnet Mask) - GeeksforGeeks
Netmask Quick Reference Chart
Subnet mask cannot mask out non-zero bits" - The Meraki Community
Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References
In simplest way possible, describe the 'impact' of shifting an IP subnet mask bit one position to the left (assume the starting mask is 255.255.255.0) what does that change accomplish? - Quora
Subnetting and Subnet Masks Explained
ICND1 - Video #9 - IP Addressing - Part 3 (Advanced Subnetting) - YouTube