rDNS scanning

[Corey Chandler <lists () sequestered net>]

My apologies for this relatively basic question.

If I want to do a reverse DNS scan of a particular network, the best I'm 
able to come up with is:

Singularity$ nmap -R -sL --dns-servers 10.101.16.4 10.101.0.0/16
Starting Nmap 4.76 ( http://nmap.org ) at 2008-12-05 17:48 PST
Host 10.101.0.0 not scanned
Host 10.101.0.1 not scanned
Host 10.101.0.2 not scanned
Host 10.101.0.3 not scanned
Host 10.101.0.4 not scanned
Host 10.101.0.5 not scanned
Host 10.101.0.6 not scanned
Host 10.101.0.7 not scanned
Host 10.101.0.8 not scanned
Host 10.101.0.9 not scanned
Host 10.101.0.10 not scanned

This leads to a LOT of lines in the scan-- is there a way to instruct 
nmap to only return results that have a PTR record?

Thanks in advance...
-- Corey "Jay" Chandler

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