Is there any software that will find IPs used on my network?

I've inhereted a network with a lot of devices on it that do not respond to pings etc...

Servers, routers, switches, phone systems, etc...

Are there any tools out there that would help me audit my network to find what IPs are used and what IPs are available?

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pgorodConnect With a Mentor Commented:
I recommend IP Scanner which is part of the free NetTools suite.

You can find it here:

Apart from finding active IP's, it also shows the computer's hostnames and whether they are running a webserver on port 80, etc.

It is multithreaded to ensure good efficiency.
Dave BaldwinFixer of ProblemsCommented:
Port scanners will do that... if the computers allow a response.  I use Superscan from McAfee.  Looks like it only runs on XP.  There are others.
collagesAuthor Commented:
Interesting, we're running Windows 7 and Windows 2008.. any others that you recommend?
Dave BaldwinFixer of ProblemsCommented:
No, I'm not running either of those and I just noticed that Superscan was limited to XP when I looked up the page.  If you are running DHCP from Windows 2008, you should be able to get a list of the DHCP leases.  That may not include other fixed IPs though.  In addition, 'ping' may be turned off on a machine so that you would have to make an actual request to get a response.

Here's one that some others use:
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