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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Mon, 23 Mar 2009 20:10:21 +0100
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Cc: John Almberg <jalmberg@identry.com>
Subject: Re: utility that scans lan for client?
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On Monday 23 March 2009 19:59:36 John Almberg wrote:
> I've tried googling for this, but I guess I don't know the name of a
> utility such as this...
>
> What I'm looking for is a utility that can scan a LAN for attached
> clients... i.e., computers that are attached to the LAN.
>
> I have one box (an appliance that I have no access to), that is on
> the LAN but I don't know what IP address it's using. I'd like to
> complete my network map, and that is the one empty box on my chart.

security/nmap

If the box pings, you can simply scan your LAN like:
$ nmap -sP 192.168.2.0/24

Starting Nmap 4.76 ( http://nmap.org ) at 2009-03-23 11:05 AKDT

<hosts snipped>

Nmap done: 256 IP addresses (18 hosts up) scanned in 1.11 seconds

There's tons of options available (including OS fingerprinting), most of which 
will require root to run as it needs on-the-fly changes to IP packets.
-- 
Mel