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LockDown32Flag for United States of America

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Need recommendation on a simple network mapping/discovery tool

Looking for something to map/discover a network of only two servers and 30 workstations. Something simple and inexpensive. The network is spread across 4 buildings and there are a bunch of printers and PLCs involved.
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nmap    - free, both source and use.
In addition, if you are looking for IP Addresses, you can use Advanced IP Scanner from Famatech). It’s free and does a good job
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I use Advanced IP Scanner for discover but it lacks mapping. Just tried nmap and didn't see much in the way of mapping either. Looking for something that will give you a GUI of the layout.
Advanced IP Scanner is not a mapping tool. I was thinking of it in addition to nmap.

Perhaps try jNetMap (source forge)

Commercial mapping tools are pricey
Then define what you expect from mapping please.
If you interested in network topology try LanTopolog
Nothing more then displaying a switch and then display what is attached to that switch. GUI. Did I miss something in NMap? Didn't see one.
Try the GUI net map I suggested above
If all you're looking for is IP and device name you can use
nmap -sn

Open in new window

If you want a little more information (open ports, OS (if available, etc) you could try
nmap -O -sF

Open in new window

Can't make out jNetmap John. It looks like it is only findng maybe one switch and is displaying things from only that one switch. It it were a simple network with one switch it would be fine but it won't find or display the other switches. Which "view" should I pick if I have multiple switches?
Visio back in the day had plug-ins for creating a pretty neat map of a network using a number of different methods to get there. Not sure it would do that anymore?
It may only work in one subnet.  That being the case, I am not sure other than the expensive mappers what will traverse the networks .
many network mapping tools need SNMP access to ask configurationquestion at equipment (like interfaces and addresses) so they can decide where to poll all addresses with an nmap like tool on that network etc. etc.

It also requires to have all devices running SNMP and be readable at mostly the "public"  community name, for the most easy tools withut authentication.
==> the complete configurations (including) password get accessible for all on your network. unless you restrict it to allowed access from one source.
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Of all of them the LanTopol was by far the slickest and easiest. Sweet little mapper for $30
I am glad that you have been useful, LanTopolog has been useful on several occasions and in case of problems do not hesitate to contact the author is really available to solve any problems