How to loop through all the values of a list, run the same search for each value, and finally combine the results?

Hi, Here is an example. I have a list of IP addresses and for each IP address I need to find out all the hosts assigned to it during the past 7 days. The process for finding the assigned hosts for each individual IP address is the same for every IP address in the list. How I can loop through the list and combine the individual results at the end? Thanks and Regards, Wayne