The use of private/custom nameservers is fully supported on cPanel & WHM systems, but must first be set up with your domain registrar. The following are the instructions for setting this up with NameCheap.
To register with NameCheap, perform the following steps:
- View the domains in your account.
- Click on the domain.
- Click Nameserver Registration.
- Enter the IP addresses for each of your nameservers.
- Click Add Nameservers >> .
More information is in our documentation here: