How can i point subdomain to ip:port
That's not possible for web addresses. You will need to point them to the same port, and then use something like nginx on the server to send it to the correct place there.
Similar Threads
Minecraft (IP:Port) forward to (Subdomain)
CDCloudflare Developers / general-helpForwarding website ip:port to single subdomain
CDCloudflare Developers / general-helpHow can I use cloudflare to point my subdomain, to another domain with port?
CDCloudflare Developers / general-help