There are some tools available to scan the MAC address in the network. NMAP is one of the most well known utility, you can find all MAC address ( Hardware address ) on your network.

Nmap is a free and open source tool utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.

Install NMAPnmap,

In Ubuntu Linux

apt-get install nmap

In Redhat/CentOS/Fedora Linux

yum install nmap

Run the following command

root@linuxinternetworks:/home/sathish# nmap -sP 192.168.1.0-255

Starting Nmap 5.21 ( http://nmap.org ) at 2012-06-25 18:16 IST
Nmap scan report for 192.168.1.1
Host is up (0.0011s latency).
MAC Address: 00:0F:A3:7B:34:F4 (Alpha Networks)
Nmap scan report for 192.168.1.2
Host is up (0.00070s latency).
MAC Address: 6C:FD:B7:48:EB:D9 (Unknown)
Nmap scan report for 192.168.1.5
Host is up (0.00059s latency).
MAC Address: 52:44:00:3C:91:3F (QEMU Virtual NIC)
Nmap scan report for 192.168.1.8
Host is up (0.000097s latency).
MAC Address: 54:04:A6:EF:64:77 (Unknown)
Nmap scan report for 192.168.1.9
Host is up (0.000080s latency).
MAC Address: 54:04:A6:EF:64:77 (Unknown)
Nmap scan report for 192.168.1.10
Host is up (0.0038s latency).
MAC Address: 00:22:B7:90:EA:33 (D-Link)
Nmap scan report for 192.168.1.11
Host is up (0.00012s latency).
MAC Address: 00:14:C6:C2:08:2F (Asustek Computer)
Nmap scan report for 192.168.1.13
Host is up (0.00052s latency).
MAC Address: 00:17:71:80:46:2C (ZKSoftware)
Nmap scan report for 192.168.1.16
Host is up (0.00016s latency).
MAC Address: 00:24:8C:C6:1F:67 (Asustek Computer)
Nmap scan report for 192.168.1.18
Host is up (0.00014s latency).
MAC Address: 00:E0:4D:A5:25:59 (Internet Initiative Japan)
Nmap scan report for 192.168.1.24
Host is up (0.000099s latency).
MAC Address: 90:E6:BA:50:C4:79 (Asustek Computer)
Nmap scan report for 192.168.1.25
Host is up (0.00029s latency).
MAC Address: E0:CB:7E:CA:2C:20 (Unknown)
Nmap scan report for 192.168.1.33
Host is up (0.00049s latency).
MAC Address: F4:6D:14:D6:31:EA (Unknown)
Nmap scan report for 192.168.1.37
Host is up (0.00028s latency).
MAC Address: 00:1F:16:C2:0A:1D (Asustek Computer)
Nmap scan report for 192.168.1.40
Host is up.
Nmap scan report for 192.168.1.70
Host is up (0.00014s latency).
MAC Address: E0:CB:4E:DD:8A:81 (Unknown)
Nmap scan report for 192.168.1.86
Host is up (0.00012s latency).
MAC Address: 48:5B:39:59:8D:ED (Unknown)
Nmap scan report for 192.168.1.93
Host is up (0.000099s latency).
MAC Address: 48:5B:39:43:93:B9 (Unknown)
Nmap scan report for 192.168.1.97
Host is up (0.00010s latency).
MAC Address: F4:6D:04:E4:FC:46 (Unknown)
Nmap scan report for 192.168.1.99
Host is up (0.00095s latency).
MAC Address: 00:80:11:05:E8:2A (Uniden)
Nmap scan report for 192.168.1.100
Host is up (0.000094s latency).
MAC Address: 00:23:18:44:62:2C (Asustek Computer)
Nmap scan report for 192.168.1.102
Host is up (0.000094s latency).
MAC Address: 00:26:18:05:58:CC (Asustek Computer)
Nmap scan report for 192.168.1.129
Host is up (0.00011s latency).
MAC Address: 00:30:67:56:44:65 (Biostar Microtech Int’l)
Nmap scan report for 192.168.1.189
Host is up (0.00010s latency).
MAC Address: F4:6D:04:74:FC:51 (Unknown)
Nmap scan report for 192.168.1.211
Host is up (0.000097s latency).
MAC Address: 00:26:18:3B:0E:AA (Asustek Computer)
Nmap scan report for 192.168.1.225
Host is up (0.000097s latency).
MAC Address: 50:26:18:7F:B7:F0 (Asustek Computer)
Nmap scan report for 192.168.1.221
Host is up (0.000097s latency).
MAC Address: 48:5B:39:89:E5:98 (Unknown)
Nmap scan report for 192.168.1.234
Host is up (0.075s latency).
MAC Address: 5C:B5:24:26:9B:52 (Unknown)
Nmap scan report for 192.168.1.237
Host is up (0.041s latency).
MAC Address: 90:84:0D:AC:66:AA (Apple)
Nmap scan report for 192.168.1.238
Host is up (0.000097s latency).
MAC Address: 48:59:39:1B:CB:0A (Unknown)
Nmap scan report for 192.168.1.240
Host is up (0.047s latency).
MAC Address: 14:78:11:41:80:D1 (Unknown)
Nmap scan report for 192.168.1.244
Host is up (0.052s latency).
MAC Address: 00:1B:37:0B:14:1D (Intel Corporate)
Nmap done: 256 IP addresses (32 hosts up) scanned in 4.45 seconds

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