So, a MAC address can look like this: 05-b6-12-28-7c-da. So, the MAC address looks like hh:hh:hh:hh:hh:hh where h refers to a hexadecimal digit. These twelve digits are further broken into six sets of two hexadecimal numbers each separated by a ‘:’ or ‘-‘. This popular convention is referred to as MAC-48 (for network hardware) and each MAC address consists of a 12-digit hexadecimal number. So, even though you identify and send a packet to a network device using its IP address, the IP address is mapped to its corresponding permanent MAC address.Ī MAC Address has a standard naming convention overseen by the IEEE which enables all the hardware manufacturers to assign unique MAC Addresses to their device. The ARP Table (Address Resolution Protocol Table) maintained by network devices contains the mapping between IP address and its corresponding MAC address, in order to identify and enable the network devices to communicate with each other. A MAC address is also known as the physical address or the hardware address of a device.Ī network device (like a computer, server, etc) can have multiple Network Interface Cards and each of them is assigned a unique MAC address. In contrast, MAC addresses are fixed and they function at the Data Link Layer(L2). Even though every network connected device has an IP address to identify them at the network layer (元), the IP address is frequently changed (by a DHCP Server, for example). What is a MAC Address?Ī MAC address is a permanent address which is assigned to the network interface of every network connected device (NIC Cards, Wireless Adapters, etc) by the hardware manufacturers. In this article, you can read a short introduction to What is MAC address, MAC filtering & MAC spoofing. MAC Address or Media Access Control Address (physical address/ hardware address) is the permanent address embedded in NIC (Network Interface Cards) and Wireless Adapters.
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