code: def cmd_ip_counter(self):
          
          ip_counter = defaultdict(int)
          for line in self._valid_lines:
              ip = line.get_ip()
              if ip is not None:
                  ip_counter[ip] += 1
          return ip_counter
docs: Reports a breakdown of how many requests have been made per IP.
  
          .. note::
            To enable this command requests need to provide a header with the
            forwarded IP (usually X-Forwarded-For) and be it the only header
            being captured.