can nmap output information about closed ports or hosts that are down?

["Kathy Simm" <kathys39 () hotmail com>]

I currently use nmap and it's xml output to monitor several large networks 
for a client.  I would like to keep track of  not only open ports, but ports 
that nmap scanned and found down, or filtered, and hosts that are scanned, 
but reported as down.  Is there something out there that already does this 
without my having to write parsing code for this? I've looked at pbnj, umit, 
etc - all great tools, but I don't see anything that records closed ports 
and/or down hosts.  Or do I need to look t modifying nmap to do this?

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