WHMCS User and IP Control offer a variety of additional protective measures, aside from the ones already listed. Take a look at the additional features this addon brings to WHMCS

1. IP Addresses stored for all WHMCS client/subclient logins
2. Sortable list of client/subclient logins
3. A list of the last 5 IP addresses available on client admin profile
4. A link to all of said client’s logins available on their admin profile
5. The ability to block domains or IP addresses via the administrative area

As you can see we’ve gone to quite a bit of trouble to ensure that client and admin areas are secure here.