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
How to Calculate IP Subnet Address with ipcalc Tool ? - GeeksforGeeks
How to Calculate a CIDR
Guide to Subnet Mask (Subnetting) & IP Subnet Calculator
Network calculator - Apps on Google Play
Bitcricket IP Calculator: Screenshots - Software Informer
IP Subnet Calculator
Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References