Here is an online tool you can use to TCP Port Scanner, Online Port Scan, Port Scanning | IPVoid
It take an IPv4 or IPv6 address to scan, and select Scan all common ports.
But if you would be willing to share your Domain Name, that would be most helpful.
Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.