Simple ruby class for loading a list of unprovisioned IPv4 addresses and testing if an IP is in that range

bogon_list.rb

require "ipaddr"
require "net/http"

# Q: What is a bogon?
# A: See http://www.team-cymru.org/Services/Bogons/
class BogonList
  LIST_URL = "http://www.team-cymru.org/Services/Bogons/fullbogons-ipv4.txt"

  def self.addresses
    @addresses ||= self.load
  end

  def self.load
    bogons = []

    Net::HTTP.get(URI.parse(LIST_URL)).each_line do |line|
      if line !~ /^#/
        bogons << IPAddr.new(line.chomp)
      end
    end

    @addresses = bogons
  end

  def self.include?(addr)
    addr = IPAddr.new(addr)

    BogonList.addresses.any? { |range| range.include?(addr) }
  end
end