My Personal IP Conversion Table

This is a chart I came up with to remember misc IPV4 info.

I found it easier to memorize a couple lines and then work in either direction to create the whole chart for exams in a matter of a minute or 2.

Hopefully you find it as helpful to: 

 

CIDR SM HOSTS X2 SN C SN B SN A
/8 255 ooo   24      
/9 128 oo   23     2
/10 192 oo 4194304 22     4
/11 224 oo 2097152 21     8
/12 240 oo 1048576 20     16
/13 248 oo 524288 19     32
/14 252 oo 262144 18     64
/15 254 oo 131072 17     128
/16 255 oo 65536 16     256
/17 128 o 32768 15   2 512
/18 192 o 16384 14   4 1024
/19 224 o 8192 13   8 2048
/20 240 o 4096 12   16 4096
/21 248 o 2048 11   32 8192
/22 252 o 1024 10   64 16384
/23 254 o 512 9   128 32768
/24 255 o 256 8   256 65536
/25 128   128 7 2 512 131072
/26 192   64 6 4 1024 262144
/27 224   32 5 8 2048 524288
/28 240   16 4 16 4096 1048576
/29 248   8 3 32 8192 2097152
/30 252   4 2 64 16384 4194304
/31 254   2 1 128 32768  
/32 255   1        

 

128 64 32 16 8 4 2 1

128 192 224 240 248 252 254 255

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