I have mydomain.com registered with 1and1. I would like to create sub.mydomain.com on a different hosting service that uses cpanel. I can create the subdomain, but where do I find the IP address to use for the subdomain A record on 1and1? My cpanel account has a static IP address, but how do I indicate that I want sub.mydomain.com within the account? Do I need a CNAME record instead of an A record? If so, what does it point to?