code: def filter_ip_range(ip_range):
      
      def filter_func(log_line):
          ip = log_line.get_ip()
          if ip:
              return ip.startswith(ip_range)
  
      return filter_func
docs: Filter :class:`.Line` objects by IP range.
  
      Both *192.168.1.203* and *192.168.1.10* are valid if the provided ip
      range is ``192.168.1`` whereas *192.168.2.103* is not valid (note the
      *.2.*).
  
      :param ip_range: IP range that you want to filter to.
      :type ip_range: string
      :returns: a function that filters by the provided IP range.
      :rtype: function