The term Virtual Host refers to the practice of maintaining more than one server on one machine, as differentiated by their apparent hostname. ... Apache was one of the first servers to support IP-based virtual hosts right out of the box. ... Below is a list of documentation pages which explain all details of virtual host support in Apache version 1.3 and later. IP-based Virtual Hosts . ... Folks trying to debug their virtual host configuration may find the Apache -S command line switch useful. ...