When Do I Need Ddns Service - ZyXEL Communications SBG3300 series User Manual

When do I need DDNS service?

When you want your internal server to be accessed by using DNS name rather than
using the dynamic IP address we can use the DDNS service. The DDNS server allows
to alias a dynamic IP address to a static hostname. Whenever the ISP assigns you a
new IP, the device sends this IP to the DDNS server to update its records.