Hi Sedat, I guess it depends on exactly how you're providing the Internet access to your users, but if you're using Squid, then Squidalyser ( http://ababa.org/ ) may do the job. It scans the Squid log files and then puts the results into a mySQL database. There's quite a lot of search functionality and that sort of gear.
I'm not entirely sure whether it provides the DNS names of the hosts, but I'm sure there's an option in either Squid itself or possibly Squidalyser that allows you to resolve the IP addresses it collects. Cheers, Mick Conroy.
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