cPanel functions and relies on the default selected ports for the services running on it.
Below is a list of common ports used by cPanel for its available services.
NON-SSL Enabled
Webmail
http://domain_name:2095
http://domain_name/webmail
Control Panel
http://domain_name:2082
http://domain_name/cpanel
WebHost Manager (WHM)
http://domain_name:2086
http://domain_name/whm
SSL Enabled
Webmail
http://domain_name:2096
https://domain_name/webmail
Control Panel
http://domain_name:2083
https://domain_name/cpanel
WebHost Manager (WHM)
http://domain_name:2087
https://domain_name/whm