ARP-Scan / aNmap alternatives on Android?
Credit to Firelord for linking me to the solution. Original response by Squidly. The solution was to use ip neigh show dev &lt;interface&gt; if you're rooted. 

If there are active clients you should get something like this -



In case the clients aren't active and you're looking this up for OUI lookup purposes, I also added grep -i -e reachable -e delay | grep -o ' ..\:..\:..' to filter them.