dig returns list of root name servers for certain sites

[Vishwas]

Hi all,

Following are the websites among top 500 websites over the Internet.
And they do not have authoritative DNS! Some of these are adult
web-sites -- BEWARE.

Am wondering how did these site populate their IP addresses at the
time of their inception.

www.89.com
www.thottbot.com

Am interested in knowing the DNS server responsible for these sites
and the TTL set.

And, something is wrong with the following sites' DNSs

www.4399.com
www.btchina.net

Any comments?

-- 
Best Regards,
Vishwas.
ivishwas.googlepages.com

If you can't explain it to a six year old, you don't understand it
yourself. -- Albert Einstein