A MAC address, or Media Access Control address, is a 48- or 64-bit address associated with a network adapter. While IP addresses are associated with software, MAC addresses are linked to the hardware of network adapters. For this reason, the MAC address is sometimes called the hardware address, the burned-in address (BIA), or the physical address. MAC addresses are expressed in hexadecimal notation in the following format: 01-23-45-67-89-AB, in the case of a 48-bit address, or 01-23-45-67-89-AB-CD-EF, in the case of a 64-bit address. Colons (:) are sometimes used instead of dashes (-).
MAC addresses are useful for security purposes, as they are only rarely changed from the default. IP addresses can change dynamically, especially on networks using DHCP to assign IP addresses, so MAC addresses are often a more reliable way to identify senders and receivers of network traffic. On wireless networks, MAC address filtering is a common security measure to prevent unwanted network access. In MAC address filtering, a wireless router is configured to accept traffic from certain MAC addresses. In this way, as whitelisted devices are assigned new IP addresses through DHCP, they retain their ability to communicate on the network. Any intruder attempting to impersonate a valid user on the network by masquerading with a faked IP address will not be able to do so because the computer's MAC address will not match any of those in the whitelist. This security method is only minimally successful, however, as a determined intruder can fake a MAC address almost as easily as an IP address.
First of all we have to know where we can take a look at the mac address. Follow my steps.
Look for Physical Address. This your MAC address. Make sure you get the physical address of the correct network adapter - usually there are several listed.
How to change MAC Address ?
Under “Advanced” tab you should see an item called “Network Address” click on it. (See figure below as an example)
On the right side, under “Value”, type in the New MAC address you want to assign to your NIC.