Are Subdomains Limited To One Level? in CPanel and Site Maintenance Posted December 9, 2003 Sorry, I was wrong. Since there were two similar threads on this issue I decided to do a little research and looked up the RFC that would possibly help explain things. Well I ended up with a headache trying to understand what was said in the RFC Here it is for any of the brave souls reading. http://www.faqs.org/rfcs/rfc1034.html The URL is read from left to right not right to left as I mentioned. The hiearchy of the tree structure is determined from right to left, highest to lowest. The period is not a character and will still act as a separator.