Hosting more than 1 website through 1 public IP

I have 2 websites e.g: http://abc.xyz.co.in and http://123.xyz.co.in:8089 hosted in a single physical server(Windows Server 2012) in port 80 and 8089. The server is in MZ zone and it is behind Exteal DNS, load balancer,firewall etc. My xyz.co.in domain is resolved into a public IP say: 11.22.33.44.

Now, I dont my users to remember the port numbers for every websites that I host on this server. How can I simplify the URL by removing the port number from it.

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