Can I get a list of all computers on my network that respond to ARP? (or…?)

sofakng

I'm trying to find the IP address of an unused Linksys router. I know it's on my same subnet and is on the same block of IPs (eg. its 192.168.0.XXX).

Can I send a broadcast of ARP requests for every IP in my subnet to find the "active" IPs?

Cry Havok

Three options spring to mind:

Broadcast ping (not all devices will respond though)
Ping each IP one at a time
Do a factory-defaults reset to put it's IP back to the one specified in the manual

sofakng

How do I do a broadcast ping?

I'm trying to avoid resetting the router…

Cry Havok

It varies according to your OS. Check the help/man page for your version of ping and see if it's a command line switch or you simply ping the broadcast address.

cmb

I'd use nmap to ping scan the entire subnet. After that, even firewalled hosts that don't respond to the ping will be in your ARP table.

example:
nmap -sP 192.168.0.0/24