code: def create_from_string(cls, cidr, label=None, whitelist=False):
          
          network = netaddr.IPNetwork(cidr)
          start = network.first
          stop = start + network.size - 1
          obj = cls.objects.create(label=label, start=start, stop=stop,
                                   whitelist=whitelist)
          return obj
docs: Converts a CIDR like 192.168.0.0/24 into 2 parts:
              start: 3232235520
              stop: 3232235775