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From: "Simon Gray" <simong@desktop-guardian.com>
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cc: Frederick Bowes <fred@k1x.org>
Subject: Re: Using freebsd to analyse ip usage?
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> Hello Everyone,
>
> 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

You could use nmap

cd /usr/ports/security/nmap && make install

and then do something like

nmap -sP 192.168.0.0/24

(that should tell you what ip's are up)

Hope this helps,

Simon