Wildcard DNS – subdomain profile

A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by  “*” as the left most label of a domain name, e.g. *.example.com.

DNS zone Entry

example.com. 86400	IN	SOA	example.com. hostmaster.example.com.
	IN	NS	ns1.example.com.
	IN	NS	ns2.example.com.
	IN	MX	10      mail.example.com.
	IN	A	192.168.1.1
mail		A	192.168.1.1
ns1		A	192.168.1.1
ns2		A	10.0.0.2
*.example.com.		A	192.168.1.1

.htaccess file:
<IfModule mod_rewrite.c>

RewriteCond %{HTTP_HOST} !^www\.example\.com
RewriteCond %{HTTP_HOST} ([^.]+)\.example\.com
RewriteRule ^$ profile.php?uid=%1

</IfModule>

Now if you want sandeepverma.example.com it will redirect to profile.php with uid=sandeepverma