![]() ![]() The IEEE encourages adoption of the more plentiful EUI-64 for non-Ethernet applications. The IEEE has a target lifetime of 100 years (until 2080) for applications using EUI-48 space and restricts applications accordingly. ![]() The IEEE manages allocation of MAC addresses, originally known as MAC-48 and which it now refers to as EUI-48 identifiers. This 48-bit address space contains potentially 2 48 (over 281 trillion) possible MAC addresses. ![]() The IEEE 802 MAC address originally comes from the Xerox Network Systems Ethernet addressing scheme. The b0 bit distinguishes multicast and unicast addressing and the b1 bit distinguishes universal and locally administered addressing. However, two network interfaces connected to two different networks can share the same MAC address.Īddress details The structure of a 48-bit MAC address. Network nodes with multiple network interfaces, such as routers and multilayer switches, must have a unique MAC address for each network interface in the same network. MAC addresses are formed according to the principles of two numbering spaces based on extended unique identifiers (EUIs) managed by the Institute of Electrical and Electronics Engineers (IEEE): EUI-48-which replaces the obsolete term MAC-48-and EUI-64. The address typically includes a manufacturer's organizationally unique identifier (OUI). Many network interfaces, however, support changing their MAC addresses. Each address can be stored in the interface hardware, such as its read-only memory, or by a firmware mechanism. MAC addresses are primarily assigned by device manufacturers, and are therefore often referred to as the burned-in address, or as an Ethernet hardware address, hardware address, or physical address. As typically represented, MAC addresses are recognizable as six groups of two hexadecimal digits, separated by hyphens, colons, or without a separator. ![]() Within the Open Systems Interconnection (OSI) network model, MAC addresses are used in the medium access control protocol sublayer of the data link layer. This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth. Label of a UMTS router with MAC addresses for LAN and WLAN modulesĪ MAC address (short for medium 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. And if you want to change your public IP, try one of the best VPN services.Not to be confused with Mac Address (YouTube channel). We've compared public and private IPs if you'd like more info. To find your public IP, simply Google "what is my IP address" or visit a site like. Your public IP doesn't affect the "another device is using your IP address" error that you might see on your Mac. While you can pay your ISP for a static IP address, a dynamic public IP is fine for most people. In contrast, your public IP is what the rest of the internet sees when any device on your network goes online. A manual (or static) private IP makes it easier to locate devices on your network by their IP addresses. Most home networks use the same range of addresses (often starting with 192.168.0.X), but those values are only used by your local network. Finally, we should quickly mention the two different kinds of IP addresses for clarity.Įverything we discussed above pertains to private IP addresses, which are used only on your network. ![]()
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