second level domain trick

.htaccess

RewriteEngine On
Options +FollowSymlinks
RewriteBase /

#RewriteCond %{HTTP_HOST} !www.dns.it
#RewriteCond %{HTTP_HOST} (.*).dns.it
#RewriteRule ^(.*)$ %1/$1

RewriteCond %{HTTP_HOST} whois.dns.it
RewriteCond %{REQUEST_URI} !_whois/
RewriteRule ^(.*)$ _whois/$1 [L]

RewriteCond %{HTTP_HOST} tld-info.dns.it
RewriteCond %{REQUEST_URI} !_tld-info/
RewriteRule ^(.*)$ _tld-info/$1 [L]

RewriteCond %{HTTP_HOST} tld.dns.it
RewriteCond %{REQUEST_URI} !_tld-info/
RewriteRule ^(.*)$ _tld-info/$1 [L]