However, MAC address spoofing is limited to the local broadcast domain.Ī host cannot determine from the MAC address of another host whether that host is on the same link (network segment) as the sending host, or on a network segment bridged to that network segment. Unlike IP address spoofing, where senders spoofing their address in a request direct the receiver into sending the response elsewhere, in MAC address spoofing, the response is received by the spoofing party. The IEEE claims trademarks on the names EUI-48 and EUI-64, in which EUI is an acronym for Extended Unique Identifier.Īlthough intended to be a permanent and globally unique identification, it is possible to change the MAC address on most of today's hardware, an action often referred to as MAC spoofing. MAC addresses are formed according to the rules of one of three numbering name spaces managed by the Institute of Electrical and Electronics Engineers (IEEE): MAC-48, EUI-48, and EUI-64. It may also be known as an Ethernet hardware address (EHA), hardware address, adapter address, or physical address. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number.
MAC addresses are most often assigned by the manufacturer of a network interface card (NIC) and are stored in its hardware, the card's read-only memory, or some other firmware mechanism.
Logically, MAC addresses are used in the Media Access Control protocol sub-layer of the OSI reference model. Media Access Control address (MAC or sometimes called ethernet address) is a unique identifier assigned to network interfaces for communications on the physical network segment.
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