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
Netmask Quick Reference Chart
Subnetting an IP Address
Guide to Subnet Mask (Subnetting) & IP Subnet Calculator
Subnet mask quick reference » cyberfella ltd
Subnet Mask Cheat Sheet (2023): Beginner to Advanced