Ports used by Cpanel Control panel are
2082 cPanel Control Panel 2083 cPanel Control Panel (SSL) 2086 WHM 2087 WHM (SSL) 2095 Webmail 2096 Webmail (SSL)
It is always better use
http://yourdomain.extn/cpanel http://yourdomain.extn/whm http://yourdomain.extn/webmail
As you can get blocked by server firewall if you access wrong PORT. This will be considered as PORT SCAN by many web server security software and auto block your IP.