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What is a MAC Address?

MAC address, or Media Access Control, is a unique numeric identifier associated with a network card or other computer peripheral. It is also a required part of the network configuration.



MAC is a relatively new technology, and is used by most modern computer hardware. It is based on a set of 48 bits, and is the largest numerical symbol that is supported by any modern computer hardware. The MAC address may be stored in the firmware, but most of the time it is assigned by the hardware manufacturer. The standard notation for the MAC address is written in transmission order, with the least significant bit transmitted first. MAC addresses are not the only data type supported by modern computers, and there are numerous network interfaces that support changing the MAC address.


For a computer geek, a MAC address is a dream come true. As part of the hardware configuration, the MAC address is a useful piece of information to know, and if it is not readily available from the manufacturer, then it is a good idea to keep a printout of the MAC address. For example, some printer manufacturers attach a label to the manual or printout. For example, the label may read, "Physical Address" or "MAC Address." It is a good idea to have a MAC address on hand in case of troubleshooting.



It is possible to get a MAC address using the ifconfig tool. This is a command line utility, and is available for both Windows and UNIX systems. To get a MAC address for your machine, type ipconfig /all into the Command Prompt and press Enter.


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