MAC Address Generator
Generate random Media Access Control (MAC) addresses in your preferred format.
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MAC Addresses Explained
A MAC (Media Access Control) address is a 48-bit hardware identifier assigned to every network interface card (NIC). It is used for communication within a local network and is typically written as six pairs of hex digits: AA:BB:CC:DD:EE:FF.
MAC Address Structure
- OUI (bits 1–24) — Organizationally Unique Identifier; identifies the manufacturer
- NIC-specific (bits 25–48) — unique identifier assigned by the manufacturer
- Bit 1 (LSB of first octet): 0 = unicast, 1 = multicast
- Bit 2: 0 = globally unique (burned-in), 1 = locally administered
- Total possible MACs: 2⁴⁸ = 281 trillion
Common Uses
- Layer 2 (Ethernet) frame addressing — identifies source and destination devices on a LAN
- DHCP server assigns IP addresses to specific MAC addresses
- Network access control — MAC filtering on Wi-Fi routers
- Device fingerprinting and inventory management
Can MAC addresses be changed (spoofed)?
Yes — most operating systems allow changing the MAC address in software, overriding the factory-burned-in address. This is called MAC spoofing. Modern devices (iOS 14+, Android 10+, Windows 10+) randomize MAC addresses by default when scanning for Wi-Fi to prevent tracking across networks.
How do I find my MAC address?
Windows: ipconfig /all (shows "Physical Address"). macOS/Linux: ifconfig or ip link. On Windows, look for the adapter you're using (Wi-Fi or Ethernet) — listed as a 12-hex-digit address like A4-C3-F0-1E-55-12. Colons or hyphens are both valid separators.
Are MAC addresses globally unique?
Factory-assigned MACs are intended to be globally unique — manufacturers register OUI prefixes with the IEEE and promise to assign each unit a unique suffix. In practice, duplicates can occur from counterfeit hardware or manufacturing defects. Locally-administered MACs (set by software) have no uniqueness guarantee.