Assigning IP address to HTTP Server

I would like to do some testing internally with different versions of PHP.

Currently the HTTP Server configuration is listening on all IP Addresses
(EG *:443)

If I want to have two servers listening on say 443 they would have to be
assigned different addresses (EG 192.168.1.1:443 and 192.168.1.2:443)

I am presuming that where I have two or more HTTP servers listening on the
same port then all the servers would need to have an IP address assigned
that listen on, in this case port 443 ?

Or what happens if we have two servers set up as

Server #1 *:443
Server #2 192.168.1.1:443

I am thinking the results would be unpredictable ?

Is there a better way to do this for internal access ? (External I could
simply redirect to any port I wanted)

Thanks

Don



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