How to calculate a subnet mask from hosts and subnets | TechTarget
David Bombal on Twitter: "Peter is confused about something in Windows 10. Why does Windows automatically add subnet masks of different numbers when he configures a PC with an IP address? 10.1.1.1
What Is Subnet Mask And How To Find It?
Identifying your Default Gateway Address and Subnet Mask
Guide to Subnet Mask (Subnetting) & IP Subnet Calculator
Networking Security: IP ADDRESSING AND SUBNETTING: