For cPanel you can use:
http://{service.cpanel_domain}/cpanel -> http://yourclient.com/cpanel
Or (Recommended):
https://{module.host_name}:2083/ -> https://server1.yourawesomecompany.com:2083/
Server IP is not possible.
For FTP hostname you can use:
ftp://ftp.{service.cpanel_domain}/ -> ftp://ftp.yourclient.com/
Best Regards
These can also be added to Blesta as Custom Reports, which is super cool, and would even allow you to customize them across dates or status values, etc.