orospakr-laptop% irb
rirb(main):001:0> require 'resolv'
=> true
irb(main):002:0> Resolv.getaddress("microsoft.com")
=> "207.46.197.32"
irb(main):003:0> Resolv.getaddress("orospakr-laptop.local")
Resolv::ResolvError: no address for orospakr-laptop.local
	from /usr/lib/ruby/1.8/resolv.rb:93:in `getaddress'
	from /usr/lib/ruby/1.8/resolv.rb:43:in `getaddress'
	from (irb):3