Subnet Mask Cheat Sheet and Information

Subnet Mask

Subnet Mask Information

Have you taken a TCP/IP class? Yes, I did a long time ago. Learning TCP/IP and the OSI Model has been the eye-opener for me that really took my consulting career to the next level. I spent a week in class and learned all the binary math to figure out which subnet mask to use that would be most efficient for a network. This was great knowledge and I am good at math, but who wants to write all that math down?

That’s why we have calculators and cheat sheets!

Sometimes I just need to know quickly what a /18 is. I mean, I know most of the standard network codes by heart, but when working on a big project it helps to know all of them. Here is a quick Subnet Mask Cheat Sheet so I don’t have to go to some other website anymore.

Subnet Mask Cheat Sheet

Subnet Mask Hosts
/30 4
/29 8
/28 16
/27 32
/26 64
/25 128
/24 256
/23 512
/22 1024
/21 2048
/20 4096
/19 8192
/18 16384
/17 32768
/16 65536

Click the link below for more information on IP Subnet Mask Numbers

IP Subnet Mask Numbers

Subnet Mask Calculator

I use an Online Subnet Mask Calculator when I want a quick list of the networks included within a subnet. Check it out below;

Subnet Mask Info

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