Originally Posted by Fris

if you want to create sub domains on the fly try something like this

Options +FollowSymLinks

RewriteEngine On

# mod_dir fix
RewriteCond %{HTTP_HOST} !^(www\.)?domain\.com$ [NC]
RewriteCond %{HTTP_HOST} ^(.*\.)?([^\.]+)\.domain\.com$ [NC]
RewriteCond %{DOCUMENT_ROOT}/subs/%2%{REQUEST_URI}/ -d
RewriteRule [^/]$ http://%2.domain.com%{REQUEST_URI}/ [R=301,L]

# strip sub subdomains
RewriteCond %{HTTP_HOST} ^.*\.([^\.]+\.domain\.com)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

# abc.domain.com --> /subs/abc
RewriteCond %{HTTP_HOST} !^(www\.)?domain\.com$ [NC]
RewriteCond %{HTTP_HOST} ^([^\.]+)\.domain\.com$ [NC]
RewriteCond %1:::%{REQUEST_URI} !^(.+):::/subs/\1(/.*)?$ [NC]
RewriteCond %{DOCUMENT_ROOT}/subs/%1/ -d
RewriteRule ^(.*)$ /subs/%1/$1 [QSA,L]