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
Cisco CCNA IP Addressing and Subnetting Part V
Solved 1) IP Address is 69.67.214.64/26 Subnet Mask: Maximum | Chegg.com
Intro to Networking - IPv4 Addressing & Subnets – Ubiquiti Support and Help Center