I'm new, just trying to learn some things. I have a network securities class at school and for our final project we have to protect one of our machines against attackers in the class and use our other machine to try to crack into other people's boxes. I see a lot of tools for ping sweeps and such, but I was wondering if there is a quick way to find someones IP address on the LAN. All the ping tools I have seen, you have to give it a range of addresses, is there a tool that can go and see what is out there?