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_reverse() private

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# File lib/ipaddr.rb, line 567
  def _reverse
    case @family
    when Socket::AF_INET
      return (0..3).map { |i|
        (@addr >> (8 * i)) & 0xff
      }.join('.')
    when Socket::AF_INET6
      return ("%.32x" % @addr).reverse!.gsub!(/.(?!$)/, '\&.')
    else
      raise "unsupported address family"
    end
  end
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