Internet Activity

Is there a program that can "catch" the information packets that are sent to the base station by other computers, then decode it to show the website visited by the user? There is one for Windows, Iris, but is there a program like that for Mac? Thanks!

are you using an airport base station? i have a linksys and there is a log of all outgoing activity and it shows the ip of where they are going. log into your router and see if htere is a log somewhere. i know nothing about airport bases so i dont know if there is one there or not.