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
Subnet Cheat Sheet | Download Subnetmask Cheat Sheet PDF
Subnet Mask Cheat Sheet - A Tutorial and Thorough Guide to Subnetting!
Useful subnetting cheat sheet. This will help when subnetting. ┃ Securitron Linux blog.