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May 24, 2014

IP Subnet Masks

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So IP subnet masks can be a bit tricky. Some IP’s are usable, some are not, and /24  is a different number than how many IP’s are available or even used. What I mean is for 100 IP’s why not go /100 seams easy enough lol. Well Computer programmers are infamous for making things harder than they need to be. I guess  to scare off the easily timid. Luckily I found this really simple chart listing the translation for all the common Subnet masks.

Net bits Subnet mask total-addresses per subnet
/20 255.255.240.0 4096
/21 255.255.248.0 2048
/22 255.255.252.0 1024
/23 255.255.254.0 512
/24 255.255.255.0 256
/25 255.255.255.128 128
/26 255.255.255.192 64
/27 255.255.255.224 32
/28 255.255.255.240 16
/29 255.255.255.248 8
/30 255.255.255.252 4

 

 

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