Mod_vhost_hash_alias is a simple, fast and efficient way to automatically manage virtual hosting. it allow administrator to build massive virtual web servers, without the need to describe each virtualhost document root. it use the servername extract from the http request to build a path to the real document root. it build a digest based on the servername and split it according to a configurable directory scheme. as digest could collide, mod_vhost_hash_alias add the servername to distinguish between hash value (and allow human to do inverse lookup on directory path).

for a given servername, it could give path like that: /var/lib/www/6/ae/fa93/weuh.org/htdocs