Domain List: Customize The purpose of customizing your domain list is to (dramaticly) speed up loadtime of the subdomain and url redirection edit pages by not displaying everything. You can still browse/search the available domains by using the 'Registry' link within the site. Shared Notify: If you own private domains in the system, enabling this option will allow you to receive an email when someone attempts to attach to any of your private domains. Account ACL: This allows you to restrict what IP ranges may access your account. This is a optional security feature that will further protect your account from unauthorized access.