Dear all, According to the current Internet, in most cases, the allocation/design of DNS is not more than 3-5 levels, such as us.ibm.com etc. What's my problems is that "when using lots of DNS names with more than 5 levels, Is there some problem with the whole DNS system, such as some performance problem for searching, dificulities to operate etc.....? Could the current DNS tree architecure bear large traffic or not?" Is there somebody can provide some real data about the current Internet, such as average search time etc. As everyone knows, IPv6 is coming .......... :-) Best regards. Yours Felix. Zhang.