I was wondering if there is a test for IIS to make sure it is working properly?

I am trying to setup multiple websites with one ip address.

I have set up a DNS server and i have tested it by plugging in the ip address for my DNS server into my TCP/IP settings for my network card and still can surf the net! I am not positive tho that this is the correct way to test the DNS server. I am afraid tho that the IIS is way off! I am trying to set up IIS using Host Headers!