Types of NAPT Configuration in CentOS 5 and How to Investigate Forwarding Destinations

For example, one server (123.45.67.89) had a large Tomcat instance running.

The DNS server is located in the enterprise.
Separate subdomains for each application and
A.com
B.com
C.com
...
Z.com
Let's say

When you have ssh connection privileges and can connect to Solr on S.com:80/solr,
Is there a way to find out which port of 123.45.67.89 is flying to on S.com?

Also, I think there was a command to output the process until the request was processed in detail. Does anyone know that?
(I remember using it to find mistakes in DNS settings)

The operating system is CentOS 5 series. I don't know if iptables are being used (it may work if you enter root, but you don't have root privileges)

*We do not use the reservation port (8080 etc.) of each middleware.
aWe do not use proxies such as ajp