POLICY Message

About the relation of IP and AS

Hi,
  Is there some relations between IP address and AS numbers? I want to know an IP belong to which AS and the IPs an AS have. Where can I find it?
Thanks a lot.

Challenge.

_____________________________________________
IP¿¨¡¢ÉÏÍø¿¨ÈýÕÛÇÀ¹º  http://shopping.263.net/category08.htm
»¨580ÔªÂòÊýÂëÏà»ú£¬ËÍ100ÔªIP¿¨ http://shopping.263.net/category21.htm