# File lib/whois/server/adapters/arpa.rb, line 34
          def inaddr_to_ip(string)
            unless /^([0-9]{1,3}\.?){0,4}in-addr\.arpa$/ =~ string
              raise ServerError, "Invalid .in-addr.arpa address"
            end
             a, b, c, d = string.scan(/[0-9]{1,3}\./).reverse
            [a, b, c, d].map do |token|
              token = (token ||= 0).to_i
              if token <= 255 && token >= 0
                token
              else
                raise ServerError, "Invalid .in-addr.arpa token `#{token}'"
              end
            end.join(".")
          end