public function getMaxHostHex()
    {
        if ($this->network_size === 32 || $this->network_size === 31) {
            return implode('', array_map(
                function ($quad) {
                    return sprintf(self::FORMAT_HEX, $quad);
                },
                $this->quads
            ));
        }
        return $this->maxHostCalculation(self::FORMAT_HEX);
    }