Re: how to do a nmap for a range?

[Isaac Sabas <simplybeliv () yahoo com>]

Hi Shirish,

First of all, -sP is just doing a ping sweep, so no port scan is involved. If you want to scan your networks subnet, 
/32 won't do since you're only scanning 2 hosts. Most often your network would be a /24 network, so what you can do 
with nmap is this: nmap -sP 192.168.0.0/24 If you want to scan from 192.168.0.0 to 192.168.255.255, use: nmap -sP 
192.168.0.0/16

If you got DHCP enabled on your network, you don't need nmap to know what IP your router is using (I'm assuming the 
interface to which the LAN is connected). There are two ways to know your router's LAN IP. First is by using the 
command ipconfig in MS command prompt (if your using windows) or typing route (if your using linux). You will see the 
default gateway or the default route there. The default gateway/route is always your router.

Another way is to use traceroute/tracert(windows). Try tracerouting a host outside your network, the first output of 
the traceroute command is your router.

Hope this answers your question. Glad to help out.

Isaac Herculano S. Sabas
CCNA
E: isaac.sabas () ymail com

________________________________
From: shirish <shirishag75 () gmail com>
To: security-basics () securityfocus com
Sent: Friday, January 23, 2009 2:39:42 PM
Subject: how to do a nmap for a range?

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.
-- 
          Regards,
          Shirish Agarwal
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