How to get all IP's and online computers in a network

Hello everyone!
Anyway, I hope someone can help me... I am a newbie in Java and is very much interested to learn.
Well, I want to create a program in Java that will allow me to get all the IP address in a certain network and then only display those that are currently active or in use.
Can someone advice me on what is the best way to do this in Java? Any help would truly be appreciated. Thanks :)

People seem to ask this continually in the Networking
forum. I've never understood what would be the point
of that, but anyway they do. First thing that happens
is that the experts start asking questions like "what
does active mean" and "what does in use mean".
You might want to have a look at those posts, they
get quite entertaining.Enjoy!
http://forum.java.sun.com/thread.jspa?threadID=5184257

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How to get all IP's and online computers in a network

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