When validating your D-Link device with dlinkddns, you may receive an "Unknown Serial Number/Unknown MAC Address" error.

Please confirm the information you are entering is correct. You can find the needed information on the product label of the back/bottom of the router/device.
Note: When entering the MAC address, you MUST enter it in the following format, including colons.
e.g. 12:34:56:78:91:01