CidrCalc

cidr_calc.ex

defmodule CidrCalc do
  def addresses_for(ip) do
    {:ok, range_start, range_end}= String.to_char_list(ip) |> :orber_acl.range(:inet)

    [net_a, net_b, net_c, net_d] = Enum.zip(convert(range_start), convert(range_end))
      |> Enum.map(fn {s, e} -> s..e end)

    for a <- net_a, b <- net_b, c <- net_c, d <- net_d, do: {a, b, c, d}
  end

  defp convert(charlist_ip) do
    charlist_ip
      |> List.to_string
      |> String.split(".")
      |> Enum.map(&String.to_integer(&1))
  end
end