Z-wave network scan

I am looking for a solution to scan my z-wave network mesh.
A couple of the nodes at the far end seem to be out of the network, even though they have neighbour nodes from the network.
I thought I had seen a plugin, but now on searching, couldn't find any solution to visualize the Z-wave mesh.

There is a zwave scanner plugin and some basic mappings in indigoutilities plugin

the indigo-utilities plugin:
http://forums.indigodomo.com/viewforum.php?f=184

the survey plugin:
http://forums.indigodomo.com/viewtopic.php?f=33&t=8804
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In addition to Karl's suggestions, I have also published the Z-Wave Node Matrix script that will produce a visual representation of the network like this:

neighbors.png (32.12 KiB) Viewed 948 times

You can find it by heading to the [My Plugins and Scripts] link in my signature below (at the bottom of the page).