If you have a DI-604 Rev E. Router Firmware 3.36 or greater (3.52 is recommended) **Do not use 3.53, No-IP DDNS support is built into it. Otherwise, if your D-Link router supports DDNS and looks similar to the image below. You can simply enter in these values in the correct fields.
Goto the "Tools" tab at the top and then click on "Misc." on the left hand side. Scroll down to the "Dynamic DNS" section. Newer versions of D-Link's firmware may look different.
Server Address: enter dynupdate.no-ip.com
Host name: enter the host.domain you want updated.
Username: enter your email address that you use on the No-IP.com website
Password: enter your password for No-IP.com


If you are trying to just update the IP of your domain. Enter a dash "-" for the host.
For example, to update mydomain.com I would put -.mydomain.com in the Host Name field.

Newer Firmware is available for the DI-604 models Please upgrade to the 3.52 or greater firmware by going to D-Link's website.

If you are using the newer firmware your DDNS setup screen will look like this:

Be sure that DDNS is enabled on the page, then click apply and your all set. You may want to cycle the power on your cable/dsl modem and router to force an update.

Check your log! Go to the "status" tab on the 604 and click the log button from time to time just to make sure everything is setup.