in_addr(addr) private

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# File lib/ipaddr.rb, line 530
  def in_addr(addr)
    if addr =~ /^\d+\.\d+\.\d+\.\d+$/
      return addr.split('.').inject(0) { |i, s|
        i << 8 | s.to_i
      }
    end
    return nil
  end
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