CIDR table

toasterboy1

Came up with this last night. Seemed to work well while doing subnetting practice questions. Also with a powers of 2 list but not really needed because block size is 1 more than wildcard. Really just need the powers of 2 for questions asking to make x number of subnets or some crazy number of hosts. Thought I would share. Each column is your octet place. So /18 would be netmask:255.255.192.0 and wildcard:0.0.63.255 because /18 is in the 3rd colum related to 192 and 63.

TWX

You might want to check out my table in my sig. I've found it handy even if it is a bit large.

TallDude7

also you want to put in the number of subnets and hosts for every netmask. VERY important

toasterboy1

Thanks for the input. Tried adding hosts and subnets but just too much in one table for me. Going to write out powers of 2 and probably multiples of 16 along with the CIDR table.

fuz1on

2^8 2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0
256 128 64 32 16 8 4 2 1
0 128 192 224 240 248 252 254 255