I just heard that an US web hosting has over 5000 web sites residing in a single web server. I do not know if the web server has the processing power and memory to serve a large number of concurrent connections. On the other hand, if the web hosting clients know that they are in fact sharing a single web server with over 5000 clients, they can easily figure out what kinds of sevice levels they will have.
So the question is what is the maximum number of virtual hosts that can be supported in a web server. The answer is difficult to guesstimate. I guess it would be below 1000.
These days, a P4 machine with 512 MB and 160GB HD does not cost much for setting up a high performance web server. Why are web hosting companies so mean as not to set up more server. Is it related to the lack of IP addresses ? I guess not. Even if one single IP address in use, it is feasible to make virtual servers behind NAT to boost performance and number of web sites served.
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