Dynamic DNS (DDNS or DynDNS) is a service, that automatically and periodically updates your DNS records when your IP address changes. This is most often utilized when the end-user has a dynamic IP address and wants to bind it to a static hostname. | Dynamic DNS (DDNS or DynDNS) is a service, that automatically and periodically updates your DNS records when your IP address changes. This is most often utilized when the end-user has a dynamic IP address and wants to bind it to a static hostname. |