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A MAC address (short for medium access control address or media access control address) is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment.
In computer networking, MAC address filtering is a network access control method whereby the MAC address assigned to each network interface controller is used to determine access to the network. MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the ...
In contrast, a multicast address is used to address a specific group of devices, and a unicast address is used to address a single device. For network layer communications, a broadcast address may be a specific IP address. At the data link layer on Ethernet networks, it is a specific MAC address.
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The MAC address that is hard-coded on a network interface controller (NIC) cannot be changed. However, many drivers allow the MAC address to be changed. Additionally, there are tools which can make an operating system believe that the NIC has the MAC address of a user's choosing. The process of masking a MAC address is known as MAC spoofing.
The term message integrity code (MIC) is frequently substituted for the term MAC, especially in communications [1] to distinguish it from the use of the latter as media access control address (MAC address). However, some authors [2] use MIC to refer to a message digest, which aims only to uniquely but opaquely identify a single message.
The address assigned with DHCP is associated with a lease and usually has an expiration period. If the lease is not renewed by the host before expiry, the address may be assigned to another device. Some DHCP implementations attempt to reassign the same IP address to a host, based on its MAC address, each time it joins the network. A network ...
If you experience any of the signs below, it's likely your account is being spoofed. Please be aware that unrecognized emails in your sent folder is not a sign of a spoofed account and is an indicator that your account was hacked. • Your contacts are receiving emails that you didn't send. • You receive spam emails from your own email address.