Figure out live hosts on a network

[HTRegz]

I'd have to say that the easiest way is most likely nmap -sP.

If you are using the 192.168.0.0 Network with a 255.255.255.0 subnet mask then you'd just have to type in nmap -sP 192.168.0.0/24 (then to write to a file you simple need to append > file.name to the end)

Your other option would be (assuming this is linux) to create a lil script to do it

#!/bin/bash
i=0
rm -rf results.txt
while [ $i -le 255 ]; do
     ping -b -c 1 192.168.0.$1
     i=`expr $i + 1`
done

[Tedob1]

if you want to use ping here ya go

pinger.bat
-----------------------
for /L %%X in (1,1,254) do ping -n 1 %1.%%X |find /I "reply" >>c:\reply.txt
for /F "tokens=3" %%Y in (c:\reply.txt) do fscan %%Y >c:\scanned.txt
notepad c:\scanned.txt
del reply.txt
-----------------------

you could use this on any class network by entering the first three octets without the third "."

pinger 192.168.1
pinger 10.0.0
pinger 67.88.22

but a scanner like superscan can ping them all and scan all the ports you want only on machines that return a response much faster than a bat can. you can then save the scan to a file by pushing a button

[randytester]

Yeah Superscan is really cool, But I'm trying to build the "Lazy Mans Pen/audit CD" for myself!!!

I think the answer would to do an nmap scan via a script, but I'm trying to get the logic down to determine how it can figure out what IP's are live.

Thinking something like

nmap -sP 192.168.0.0/24 > IP.txt

as HTRegz suggested, however that will only find me the live hosts within the 255.255.255.0 network. If there was some way to ping the subnet mask to determine if it had any live hosts, and if not skip it, that would be exactly what I'm looking for.

Something like: (sorry I don't know any programming)
Ping the subnet,
If no Live hosts next subnet
If live hosts are present nmap -sP IP ADDRESS > textfile.txt

Is something like that possible?

[SonofGalen]

Something like that would indeed be very possible, either through batch-file programming or through shell scripting.

Batch file creation: http://antionline.com/showthread.php?s=&threadid=252001
Shell programming: http://antionline.com/showthread.php?s=&threadid=252818 (Not as tutorialish, but it should still prove helpful.)

[Tedob1]

change "fscan" to nmap w/ the args you want and call pinger.bat with start.bat:

start.bat
-----------------
for /L %%W in (0,1,255) do pinger 192.168.%%W
-----------------