The best way I can think of off the top of my head is to do two
similar scans, one with a ping scan and the other looking for open
ports but without pinging (-Pn) dumping them to two different files
and do a diff between them. Granted if you have a host out there
without any ports open (or you just didn't scan for the port it had
open) you'll miss it. Maybe someone else has a better idea?

Chandler Bing

On Fri, Sep 30, 2011 at 2:17 PM, Ukpong <ukpong.ukpong (at) gmail (dot) com [email concealed]> wrote:
>
> Can somebody suggest the best NMAP commands for identifying hosts that
> are not responding to ICMP ping requests ?
>
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