You could look at the MAC addresses, which reveal the manufacturer of the network device
Code:
$ arp -an
? (10.0.0.138) at 00:90:d0:83:06:7a on xl0
? (192.168.222.10) at 00:08:c7:05:ca:0b on fxp0 static
? (192.168.222.20) at 00:19:db:47:b0:4c on fxp0
? (192.168.222.33) at 00:11:d8:f1:dd:99 on fxp0
? (192.168.222.250) at (incomplete) on fxp0
Then you retrieve
http://standards.ieee.org/regauth/oui/oui.txt
The first MAC from my ARP list is
00:90:d0:83:06:7a. Searching the oui.txt file for
00-90-D0
Code:
00-90-D0 (hex) Thomson Telecom Belgium
0090D0 (base 16) Thomson Telecom Belgium
As last example the
00:11:d8:f1:dd:99 address:
Code:
00-11-D8 (hex) ASUSTek Computer Inc.
0011D8 (base 16) ASUSTek Computer Inc.