This is Jeff Custard's cheat-sheet for figuring out subnet masks and
such.


row1=bits
row2=multiple
row3=subnet mask
row4=wildcard mask

1      2      3      4        5      6      7      8
128    64     32     16       8      4      2      1
128    192    224    240      248    252    254    255
127    63     31     15       7      3      1      0