arp -n -a

result:

? (10.12.2.40) at 12:f7:fd:48:aa:79 [ether] on eth0
? (10.12.2.43) at 12:48:08:aa:a5:bb [ether] on eth0
? (10.12.2.8) at 12:ab:ed:67:34:79 [ether] on eth0
? (10.12.2.94) at 12:47:87:c2:60:8d [ether] on eth0
? (10.12.2.1) at 12:6f:56:c0:c4:c1 [ether] on eth0

You can also use the below command to view arp table.

arp -n -e

Result

Address                  HWtype  HWaddress           Flags Mask            Iface
10.12.2.40               ether   12:f7:fd:48:aa:79   C                     eth0
10.12.2.43               ether   12:48:08:aa:a5:bb   C                     eth0
10.12.2.8                ether   12:ab:ed:67:34:79   C                     eth0
10.12.2.94               ether   12:47:87:c2:60:8d   C                     eth0
10.12.2.1                ether   12:6f:56:c0:c4:c1   C                     eth0