ASUS DDNS service works based on MAC address, once you have your first router registered a favorite hostname, that will be reserved for the router for long than enough. What if you bought a new ASUS router and want to re-use your favorite hostname? You can do the following:
- Before your old ASUS router retire, use it to register a new hostname.
- The original hostname you prefer will become available after 12 hours.
- Then you can use your new ASUS router to register your preferred hostname.