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From: Charles Swiger <cswiger@mac.com>
Date: Thu, 20 Nov 2003 12:02:45 -0500
To: Frederick Bowes <fred@k1x.org>
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cc: freebsd-questions@freebsd.org
Subject: Re: Using freebsd to analyse ip usage?
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On Nov 20, 2003, at 1:26 AM, Frederick Bowes wrote:
> At work there are some unused ip addresses but we dont know which ones
> they are (because there are alot of computers) is there a port which 
> could
> be used to ping the subnet over a few days to work out which ip 
> addresses
> are actually coming online? Thanks

Running 'arp -a' on your router or some central machine like a 
fileserver will give you a good starting point.  Another poster 
suggested running an nmap ping scan, which will certainly work as well.

You might also look at your DHCP server's leases...

-- 
-Chuck