Dan York on Twitter: "Nice cheat sheet for #IPv4 subnetting (and a good reminder that if you move to #IPv6 you don't have to worry as much about all these smaller subnets
Magic Number Subnetting (Introduction)
IPv4 Subnet Mask Cheat Sheet - Beetle Digital
Subnet Mask Cheat Sheet - NetworkCalc
IP Subnetting - Cheatsheet - YouTube
Subnet Table For IPv4 Cheat Sheet by danh - Download free from Cheatography - Cheatography.com: Cheat Sheets For Every Occasion
Subnet Mask Cheat Sheet | PDF
Subnet Mask Cheat Sheet - The Cisco Learning Network
Subnetting Cheat Sheet | Download | Use Online ⋆ IpCisco