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irb(main):006:0> Socket.getaddrinfo("127.0.0.1", 0)[1][1]
=> 0
irb(main):007:0> Socket.getaddrinfo("127.0.0.1", 0)[1][2]
=> "localhost"
irb(main):008:0> Socket.getaddrinfo("127.0.0.1", 0)[2][2]
NoMethodError: undefined method `[]' for nil:NilClass
  from (irb):8
irb(main):009:0> Socket.getaddrinfo("127.0.0.1", 0)
=> [["AF_INET", 0, "localhost", "127.0.0.1", 2, 2, 17], ["AF_INET", 0, "localhost", "127.0.0.1", 2, 1, 6]]