Random MAC Address Generator — Format, Case & OUI Options

MAC (EUI-48) Basics

A MAC address is 48 bits (6 bytes). The first byte’s lowest two bits carry special meaning:

• I/G (bit 0): 0 = unicast, 1 = multicast/broadcast
• U/L (bit 1): 0 = globally unique (vendor OUI), 1 = locally administered

Use the options above to constrain these bits and optionally seed with a vendor OUI or your own 3-byte prefix.

Formats

• AA:BB:CC:DD:EE:FF (colon, default)
• AA-BB-CC-DD-EE-FF (hyphen)
• AABB.CCDD.EEFF (Cisco dotted-quartet)
• AABBCCDDEEFF (plain hex)

Note: Generated values are random and not guaranteed to be suitable for any specific device or policy.

What Is a MAC Address? (EUI-48 Explained)

A MAC address (often called hardware address or layer-2 address) is a 48-bit identifier assigned to network interfaces for communications on Ethernet, Wi-Fi, Bluetooth and other IEEE 802 networks. It’s usually shown as six bytes of hexadecimal: AA:BB:CC:DD:EE:FF. The first three bytes are a vendor prefix known as an OUI (Organizationally Unique Identifier); the last three bytes are typically assigned by the vendor or your operating system when using locally administered addresses.

Two Special Bits in the First Byte

• I/G (bit 0): 0 = unicast (individual), 1 = multicast/group
• U/L (bit 1): 0 = globally unique (vendor-assigned), 1 = locally administered

In practice, “unicast + globally unique” is what you’ll see printed on most devices. “Locally administered” is handy for virtualization, containers, privacy randomization, or lab work where you don’t want to collide with a real vendor OUI.

Common Display Formats

• AA:BB:CC:DD:EE:FF (colon-separated)
• AA-BB-CC-DD-EE-FF (hyphen-separated)
• AABB.CCDD.EEFF (Cisco dotted)
• AABBCCDDEEFF (plain hex)

Examples of Vendor Prefixes (Illustrative)

Below are well-known brands with example OUIs often seen in the field. These are for educational purposes; organizations can hold multiple OUIs and allocations change over time.

• Apple — e.g., FC:FB:D2, 28:CF:E9
• Google / Nest — e.g., 3C:5A:B4, 54:60:09
• Intel — e.g., F8:16:54, 3C:97:0E
• Cisco — e.g., 00:1B:54, 9C:57:AD
• Samsung — e.g., AC:1F:6B, 80:EA:96
• Dell — e.g., D4:6A:6A, B8:CA:3A
• HPE / Aruba — e.g., B4:99:BA, 18:64:72
• Ubiquiti — e.g., 80:2A:A8, 24:A4:3C
• TP-Link — e.g., 50:C7:BF, F4:F2:6D
• ASUS — e.g., 90:84:0D, 60:A4:4C
• Realtek — e.g., 00:E0:4C, D8:32:14
• Microsoft — e.g., 28:16:AD, 7C:1C:68
• Lenovo — e.g., 64:DF:0C, AC:72:89
• LG — e.g., F0:18:98, 14:7D:DA
• Sony — e.g., EC:1A:59, F8:46:1C

Global vs. Local Administration

A globally unique address uses a vendor OUI with U/L=0. That implies the device vendor guarantees uniqueness within its allocation. A locally administered address sets U/L=1 and can be minted by your OS or tools like this generator. Many platforms (Windows, macOS, Linux, iOS/Android for Wi-Fi privacy) support random, locally administered MACs to reduce tracking.

Good Practices & Safety

• Use unicast for normal device identities (I/G=0). Avoid multicast unless you know you need it.
• Avoid all-zeros and all-FF values; they’re special and can break tooling.
• In shared networks, confirm your policy before changing MACs—some environments use MAC filtering or security bindings.
• If you need vendor-like addresses for testing, seed with an example OUI and set U/L=1 to avoid clashing with real hardware.

This page generates MAC addresses entirely in your browser—no uploads, no logs. Use the options above to pick format, case, unicast/multicast, global vs local administration, and optional OUI seeding.