[cPanel] Add another main shared IP Address
cPanel has 1 main shared IP address which configured on Basic cPanel/WHM Setup, so you can’t add multiple accounts to use the same IP address, unless the account is reseller. So how do you add another main shared IP address?
edit /var/cpanel/mainips/root <== root is the account name,
vi /var/cpanel/mainips/root
then add another IP address which is not used by others. After that you use that IP for multiple accounts.
Info from cPanel Forum

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