@abhisekdutta

What you need to do is setup proxying. This can be done with Apache using mod_proxy and there’s a guide for exactly that here at DigitalOcean.

https://www.digitalocean.com/community/tutorials/how-to-use-apache-as-a-reverse-proxy-with-mod_proxy-on-ubuntu-16-04

Without using a proxy, which internally accepts requests for domain.com or sub.domain.com and serves domain.com:2365 (or any application running on a port, just an example), you’d need to keep the ports in the URL’s.

You create an A-Record in your DNS panel that points to the desired IP address.