Re: how to do a nmap for a range?

[Robin Wood <dninja () gmail com>]

2009/1/23 shirish <shirishag75 () gmail com>:
> Hi all,
>        Newbie to nmap. First of all thank you for a great tool.
>
> I want to use nmap to find on which IP my router is
>
> I read somewhere that you could use nmap to know where or how
> your computer is communicating through the router with some given range.
>
> Something like the following :-
>
> nmap -sP 192.168.0.1/32
>
> Starting Nmap 4.62 ( http://nmap.org ) at 2009-01-23 12:00 IST
> Host 192.168.0.1 appears to be up.
> Nmap done: 1 IP address (1 host up) scanned in 12.595 seconds
>
> The manpage gives the following info.
>
>  -sP: Ping Scan - go no further than determining if host is online
>
> Now trying the address which is supposed to be up doesn't give
> anything in the browser
>
> So I have couple of questions :-
>
> a. Is there a way to scan all the addresses for positives between
>
> 192.168.0.0 to whatever could be the ending 192.168.255.255
>
> reference :-- http://en.wikipedia.org/wiki/192.168.1.1
>
> Looking forward to any guidance on the same.

I think you've got your subnet wrong. If you want to scan 0.1 through
to 0.255 then you would need to do

nmap -sP 192.168.0.1/24

for 0.1 through to 255.255 you'd need

nmap -sP 192.168.0.1/16

Robin