There is a lot of traffic coming through the our PIX. Is there a command (like ip accounting) on the Pix so I can find out what this traffic is and were it is going

Hi I have a Pix 506, I am looking to block AIM and the other services like it. Since the services load balance I cannot just enter an IP address. I would like to block the services using there domain names. Is the possible? If so can you give me some...