What Is Media Access Control Address (MAC Address)?

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Media Access Control Address (MAC Address) answers all life's problems. If you've ever wondered what would happen if you put a cat on top of a fridge, write down your MAC address and place it safely. You can use MAC addresses to track your loved ones or determine who ate your sandwich while you were out. You can even use them to open portals to an alternate dimension where the world is upside-down! The possibilities are endless! The Media Access Control address, or MAC address, is a unique identifier for an Ethernet or network adapter over a network. It distinguishes different network interfaces and is used for several networking technologies—particularly most IEEE 802 networks, including Ethernet. MAC addresses in the Media Access Control Protocol sub-layer in the OSI model. A MAC address is often stored on an electronic device's network interface controller (NIC) or its physical driver circuit board. Plus, it's also possible to assign a MAC address manually using software tools that handle such tasks. A MAC address is a unique identifier assigned to each network interface card (NIC) by its vendor. It's similar to an IP address in that it provides a way for your computer to be identified on the network, but unlike an IP address, a MAC address is permanent and cannot be changed. It's called the Media Access Control Address because it allows computers to access data on the network media (e.g., Ethernet cables). Suppose you've been told to reset your router or modem because its MAC address has changed. In that case, this is why: routers and modems are considered "gateways" between networks and their MAC addresses must always remain unique across all devices connected to each network. MAC addresses are like your fingerprints—not just because they're both a series of numbers. Each MAC address consists of a 12-digit hexadecimal notation embedded within the NIC firmware and composed of a six-digit manufacturer's organization unique identifier (or "OID") followed by a six-digit serialized or unique random identifier. You can never be sure that two different NICs from the same manufacturer will have the same MAC address. Two further NICs from the same manufacturer can have completely different addresses. To prevent this from happening, manufacturers embed an algorithm in their devices that generates unique but not sequential addresses. The OID determines the first part of this algorithm; however, the rest is random data.

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