RE: Nmap 3.81: warning accompanies netmask /1

["Herb Martin" <HerbM () LearnQuick Com>]

> -----Original Message-----
> From: Justin Cranford [mailto:jcranford () n-able com]
> I get a warning with all versions of nmap (including 3.81)
> when I run this command:
>
>    nmap 10.0.0.0/1
>
> The error is:
>    Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2005-02-08
> 10:24 EST
>    WARNING: No targets were specified, so 0 hosts scanned.
>    Nmap finished: 0 IP addresses (0 hosts up) scanned in 0.006 seconds
>
> This only happens when I specify netmask /1. I tried all
> other netmasks from 0-32 and they scan ok. For example:
>
> nmap 10.0.0.0/0
> nmap 10.0.0.0/2
> nmap 10.0.0.0/24
> nmap 10.0.0.0/32
>
> Is this a bug?

The bug would be FAILING to show the WARNING for
/2 or even /3 (anything less than 4).

Since /1 with a network of 10 does indeed specify
"no hosts" and this continues up to /4 when the
fourth bit (from the left) if finally set by 10.x



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