ARP Scan: ARP scanning and fingerprinting tool. arp-scan is a command-line tool that uses the ARP protocol to discover and fingerprint IP hosts on the local network. It is available for Linux and BSD under the GPL licence. To install this in ubuntu: $ sudo apt-get -y install arp-scan $ sudo arp-scan -l Ex: thanigai@thanigai-laptop:~$ sudo arp-scan -l Interface: eth1, datalink type: EN10MB (Ethernet) Starting arp-scan 1.6 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/) 192.168.0.1 00:0f:a3:6d:ab:60 Alpha Networks Inc. 192.168.1.3 20:1a:39:e6:6r:14 (Unknown) 192.168.1.4 38:y7:d8:bz:04:f2 (Unknown) 192.168.1.8 60:0j:29:8f:16:aj VMware, Inc. 4 packets received by filter, 0 packets dropped by kernel Ending arp-scan 1.6: 256 hosts scanned in 1.245 seconds (114.03 hosts/sec). 4 responded More info: 1) http://www.nta-monitor.com/tools/arp-scan/ 2) http://linux.die.net/man/1/arp-scan -- Regards, Tha.Suresh Cooool Linux Tips & Tricks, http://gnutips.wordpress.com My experiences with Linux are here, http://thasulinux.wordpress.com