#!/usr/bin/env ruby

# yeah, yeah, ipv6 not supported. This is a quick hack.

unless hostname = ARGV.first
  puts "usage: gethostbyname HOSTNAME"
end

require 'socket'
packed_addr = Socket.gethostbyname(hostname).last
ip_int = packed_addr.unpack("N").last
octets = (1..4).map {|i| (ip_int % (256 ** i)) / (256 ** (i - 1) ) }.reverse
puts octets.join(".")