Originally Posted by AndrewX

Not possible with cPanel.

The concept in cPanel is to have one main shared IP address. Every other IP address is dedicated. The only way to have more than one shared IP address is to create a reseller, and designate one IP address as that reseller's shared IP address. Only that reseller can use that IP address as a shared IP address; no one else can add accounts to that reseller's shared IP address.

Edit:

You can add an unlimited amount of (addon) domains on your shared IP. But only 1 domain per dedicated IP. To have multiple domains on your other dedicated IPs, you need to create a new cPanel account in WHM with a unique shared IP, then add addon domains to it.

It is not possible to have:

1.1.1.1 (shared IP) - domain1.com domain2.com domain3.com
1.1.1.2 - domain4.com domain5.com domain6.com
1.1.1.3 - domain7.com domain8.com domain9.com

For this you need multiple cPanel accounts (so you need WHM), or another panel or you will break cPanel operations, it will not know how to handle them.