There are many ways in which a person could find an IP address. I would suggest you have a look on google under such search terms as "find IP address" or "determine website's IP address" or something along those lines.
Consider that there are roughly 4 billion IPv4 addresses possible, then take one or more tools to scan those addresses one can deduce from the information that is returned what is running at said address. Again there are many guides and tutorials on the internet that are better suited than this forum to help you with this.


