Finding ip address of pi without any video output whatsoever

hello raspians!

I'm in a bit of a predicament. I have access to an rpi, but I don't have access to a monitor. While I had access to a monitor to use with the pi, I was able to get the address and ssh in, so I know ssh works.

I'm on a laptop running linux (debian) and I've got full control of the network i'm on (admin permissions on a linksys router.

Thanks for any advice.

EDIT: I found the address using nmap commands, thanks!