ICANN sets the policies that govern domain registrations. If you sell or manage domains, you must follow their requirements for registration, renewals, transfers, and changes to contact information.
WHOIS servers check domain availability and return related information. You must use the appropriate WHOIS servers to search for domains.
Checking the IP address that domains in WHMCS point to allows you to easily identify clients that may no longer be using your service.
SSL monitoring makes it easy to see which domains have SSL, find validation issues sooner, and get advanced warning of expirations.
When you move your WHMCS installation from one server to another, you may need to perform additional steps like updating your license.
When you move your WHMCS installation from one subdomain to another on the same server, you may need to perform additional steps like updating your license.
You can take steps to optimize performance on larger installations.