Step 1: Login to your ZyXEL router via the default gateway.
Step 2: Click on “Network” and then “DDNS.”
Step 3: Click “Enable Dynamic DNS.” Select No-IP under Server Provider. Enter your No-IP hostname, username and password.
Step 4: Click on “Apply.”
Congratulations, the ZyXEL router will now send No-IP updates whenever the IP address changes.