How to identify possible virtual host

If you run arp -a you should be able to get the MAC address.  That would be instructive if you know the MAC addresses of your devices.

A crude method is to do a continuous ping to the IP address (assuming it responds to pings) and disconnect cables at your main switch until the responses stop.

If you have managed switches, they should be able to help track down on which switch port the device is located.

Please clarify, are you talking about a VM or a host, physical system that has VMs?

@arnold i meant a physical apache server that has VMs

Are you talking abou virtual host web sites, or virtual systems running..

Usually web servers are accessible via ssh.

@arnold im talking about virtual host websites

There is no detectable difference between an Apache default host and a vhost as far as clients are concerned.  To determine whether a site is a vhost or a default host, it is necessary to log into the server system and examine the Apache configuration file, httpd.conf, and any vhost includes.

Is that the information you were seeking, or is it something else?

...you can run various OSINT tools which support virtual host enumeration, such as theHarvester, etc. some tools use a word list to brute force host header names, others compile a database of DNS records showing multiple hosts associated with a single IP address, etc.