Domain name availability checker is Windows compatible. We will try to get to main page of a domain name we want to search for availability and we will request for "date" in headers (it is not necessary to request the entire page). Possible situations are: We get a response to our request, so the domain name is taken. We are anable to get a response to our request, so the domain name may be availbale (is not necessarely available: the server may be down, not accesible, or DNS entries are incorrect).