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MAC Address

MAC stands for media access control. MAC address is also known as physical address or hardware address or BIA(burnt-in-address).BIA is generally written in Cisco router switches.physical address is generally written in laptop/pc.MAC address is generally written in Mobile. MAC address is globally unic.The MAC address of a device is different from other devices.Many people are thinking there is only one mac address of a device but it is actually wrong ,Because there is no mac address of a laptop .There is a Mac address of your NIC(network interface controller) ,which is connected to your laptop .

                               (NIC)

If you change your NIC,then the Mac address of your laptop will be changed.NIC is a separate hardware component present in your computer used to connect with the network (home network or internet).There are so many ways that you can connect your laptop with the network like Ethernet, wifi etc.So,the Mac address of a laptop depends on how many NIC is connected with it.MAC address is 48 bits,which is 6 bytes .Out of these 48 bits , Starting 24 bit is OUI (organization unique identifier) and rest 24 bit is vender specific.Because of OUI(1st 24 bits) , overall MAC address is unic.MAC address is represented in hexadecimal format.overall Mac address is represented by 12 hexadecimal characters because 1 hexadecimal character is 4 bits .So,48/4=12.
MAC address is written like this -
24-AB-CD-FE-68-39(this type is generally written in laptop/pc)
24:AB:CD:FE:68:39(this type is Generally written in Mobile phones)
24AB CDFE.6839(this type is Generally written in Cisco Router switches)
The above Mac address are same but the way of representation is varies from device to device.Each companie's first 6 hexadecimal character (OUl) is decided by IANA(internet assigned network authority) and rest 6 hexadecimal character is will be decided by Company.What should  be given , that will be decided by IANA.IANA will never provide same OUI to two or more companies i.e, each companie's OUI will be different from other.So, overall MAC address is unic.

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