Quickly Find Used IP Addresses

by Daniel Petri - January 8, 2009
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Instead of manually pinging all IP addresses on your LAN you can use this nice command:

Open Command Prompt and type:

FOR /L %i IN (1,1,254) DO ping -n 1 192.168.0.%i | FIND /i "Reply">> c:\ipaddresses.txt

The "-n 1" is for only 1 ping packet to be sent to each computer.

Change 192.168.0 to match you own Network ID.

This will ping all IP addresses on the 192.168.0.0 network segment and create a text file called IPADDRESSES.TXT in C:\, where it will list only the IP addresses that gave a reply.

You can also add a -a to the PING command to resolve all the responding IP addresses to HOST names, but doing so will cause the script to take a considerable time to finish:

FOR /L %i IN (1,1,254) DO ping -a -n 1 192.168.0.%i | FIND /i "Reply">> c:\ipaddresses.txt

You can, of course, modify this script and make it suit your own desire.

I'd love to hear about any other ideas you may have .