$ ip neigh show

STDOUT
192.168.178.138 dev wlp2s0 lladdr d8:bb:c1:16:f3:7b REACHABLE 
10.11.11.2 dev enp1s0 lladdr 18:60:24:e1:47:4a STALE 
192.168.178.1 dev wlp2s0 lladdr 94:83:c4:a3:bc:ea REACHABLE 

STDERR