Network Number: $18\mathrm{.}0\mathrm{.}0\mathrm{.}0$

Required: $129$ subnets

$\backslash$table$[[\backslash$table$[[$What default class is this address? A$,$ B$,],[$or C$?]],$A$],[$What is the default subnet mask?,$255\mathrm{.}0\mathrm{.}0\mathrm{.}0],[$How many bits did you borrow?,$8$ BITS$],[\backslash$table$[[$What is the new subnet mask for this$],[$host AFTER the bits are borrowed?$]],255\mathrm{.}255\mathrm{.}0\mathrm{.}0],[$How many subnets were created?,$256],[\backslash$table$[[$How many actual hosts per subnet?$],[($Use a calculator for this one.$)]],65,536],[$How many usable hosts per subnet?,$65,534],[\backslash$table$[[$Is the address $18\mathrm{.}61\mathrm{.}127\mathrm{.}128],[$a Network, Host or Broadcast address?$]],18\mathrm{.}61\mathrm{.}0\mathrm{.}0],[\backslash$table$[[$Is the address $18\mathrm{.}238\mathrm{.}0\mathrm{.}0],[$a Network, Host or Broadcast address?$]],18\mathrm{.}238\mathrm{.}0\mathrm{.}0],[\backslash$table$[[$Is the address $18\mathrm{.}118\mathrm{.}0\mathrm{.}0],[$a Network, Host or Broadcast address?$]],],[\backslash$table$[[$Is the address $18\mathrm{.}224\mathrm{.}128\mathrm{.}0],[$a Network, Host or Broadcast address?$]],]]$