Separate IP from text in ping output?

Question

I'd like to be able to run a single batch file that would find the IP address of every device connected to my router, and then find their hostnames from it. What I have so far is below:

@echo off

set /a n=0
:repeat
set /a n+=1
echo 192.168.1.%n%
ping -n 1 -w 500 192.168.1.%n% | FIND /i "Reply">>devices.txt
if %n% lss 254 goto repeat
type devices.txt
goto :hostname

This finds all the possible addresses and writes them to a text file, devices.txt. However, I now end up with the following:

Reply from 192.168.1.82: bytes=32 time=5ms TTL=255

The next part of the batch file goes:

:hostname 
ping -a %ip% -l 1 -n 1 >> hostnames.txt

This pings the IPs found in devices.txt and returns the result in hostnames.txt - or at least, I'd like it to.

Somehow I need to separate the IP address from the other text when writing it to devices.txt, and then assign it as a variable so it can be used by the next part.

Is there a simple function I can use to do either of these things?

Answer 1

Try this:

@echo off
setlocal 

set "p=ping -n 1 -w 500 192.168.1"
for /l %%a in (1,1,254) do (
    for /f "Tokens=3 delims=: " %%b in (
      '%p%.%%a^|Find /i "TTL="'
    ) do (
      echo Pinging %%b
      echo %%b>>devices.txt
      for /f "tokens=2" %%c in (
        'ping -a %%b -l 1 -n 1^|Find /i "pinging"') do (
           echo %%c >>hostnames.txt
      )
    )
)

We start by creating a For /L loop that goes from 1 to 254 in increments of 1. Then we run a for loop on a ping command that takes the third token on the return line and puts it into a variable, %%b in this case. We then echo out pinging IP address contained in %%b and write it to devices.txt. Then, we run another ping to extract the second token which is the hostname of the computer we're pinging and write it out to hostnames.txt.