Are there any plans to add IP address update functionality for each individual sub-domain of primary domain name?

I am asking this because I have primary domain name but would like to setup sub-domains at different locations and update their IP address individually.

You can already update IP address for each individual sub-domain. Just create an 'Alias' in the 'Aliases' section and then add it to the Dynu IP Update Client in the Domains and Sub-Domains area.

In case of DDClient, you have to add it to the configuration file as shown below:

MYDOMAIN.COM&alias=ALIASNAME

Looking at the API, you simply have to include the 'alias' parameter to update the IP address for that sub-domain.

Hi Can you please tell me where can I add the above line?

In /etc/ddclient.conf file. You may refer to https://www.dynu.com/DynamicDNS/IPUpdateClient/DDClient for more information.