Free domains/subdomains

Hi!

I was wondering if anyone knows where could I register a free domainname or subdomain for testing ISPConfig ?
I registered a free subdomain earlier but that dns server just died and i have to look for some other.
I don't want to buy a domainname just for testing purposes.

 

http://freedns.afraid.org/
http://www.no-ip.com/
http://www.dyndns.com/

 

Ok,thanks.I'll try with these websites.