Are Subdomains Limited To One Level? in CPanel and Site Maintenance Posted December 8, 2003 Rick, I know of and have seen sites that have more than 2 periods in the url and my understanding is that the url is read from back to front and the first two periods found are treated as the separators for the TLD, domain, and subdomain. The next period found is now a "valid" character and treated as part of the subdomain name. This would make the "www.subdomain" the full subdomain name. So I believe the full "www.subdomain.domain.com" will work if thats how you have it in cpanel.