at the url, such as google or yahoo or youtube just have a web server. but do you know they have another servers..? like data server or DMZ server...
ok open your command prompt
at the command prompt please type the code below:-
----------------------the code-------------------
nslookup -quirytype=any google.com
--------------------end code---------------------
note: you can change google.com to another website name.
NOTE : - Please Give a credit to my blog if you take the idea from this blog. Peace:-)