If you want to check for who is hosting a website then domain host checker is the tool which best serves this purpose and provides the desired results within a few seconds. This tool will provide you the most accurate results.
You simply need to enter the URL of the website and click on check to find out which company is hosting the website. This tool will automatically explore the database and will provide the name of the server hosting that website. This tool has very simple user interface to help you explore the various options available.