def validate(self, value):
        super(IPField, self).validate(value)
        if not value and not self.required:
            return

        try:
            if self.mask:
                self.ip = netaddr.IPNetwork(value)
            else:
                self.ip = netaddr.IPAddress(value)
        except Exception:
            raise ValidationError(self.invalid_format_message)

        if not any([self.version & IPv4 > 0 and self.ip.version == 4,
                    self.version & IPv6 > 0 and self.ip.version == 6]):
            raise ValidationError(self.invalid_version_message)

        if self.mask:
            if self.ip.version == 4 and \
                    not self.ip.prefixlen <= self.max_v4_mask <= self.min_mask:
                raise ValidationError(self.invalid_mask_message)

            if self.ip.version == 6 and \
                    not self.min_mask <= self.ip.prefixlen <= self.max_v6_mask:
                raise ValidationError(self.invalid_mask_message)
dataset/ETHPy150Open CiscoSystems/avos/horizon/forms/fields.py/IPField.validate/swapped operands of `<=`