Different IP addresses on the same server. Is it easy to determine that the sites are on the same server?

Question

Computer networks

There is a server on it there are sites. 1 site on one ip, the second site on the second ip. Is it possible for the user to know that these sites are on the same server?

Answer 1

By indirect evidence, if only - the same Internet provider, the same software versions. From the outside, there is no difference whether there are sites on one server or on two neighboring ones, or even on virtual machines within the same cluster - it will look similar.
All this is true, of course, if you configure the web server to listen for specific addresses, and not all at once - otherwise you can understand by simply polling them sequentially with the appropriate Host headers.

Answer 2

You can try to execute ipconfig through php_exec or something like that.
But for this you need to be an admin of the site, and not a third-party user.