Mac Address Generator

Free online tool. All processing is client-side. No signup needed.

How to Use the Mac Address Generator

1. Enter your input values above
2. Results update automatically
3. Copy or download the output

What is a Mac Address Generator?

A MAC Address Generator creates valid, random MAC addresses for network testing, device emulation, virtual machine configuration, and privacy purposes. MAC (Media Access Control) addresses are 48-bit identifiers assigned to network interface cards — every phone, computer, router, and IoT device has at least one. This generator creates addresses in standard formats (colon-separated, hyphen-separated, or dot-separated), with options for unicast/multicast and locally-administered/universally-administered flags.

How Does It Work?

Select output format (AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, or AABB.CCDD.EEFF Cisco-style), and the number of addresses needed. The generator creates random 48-bit values while properly setting the two flag bits: bit 0 (LSB of first octet) = 0 for unicast (normal), 1 for multicast; bit 1 = 0 for globally unique (like real hardware), 1 for locally administered (prevents conflicts with real devices). Pre-set OUI (Organizationally Unique Identifier) prefixes for major manufacturers are available for realistic testing.

Formula

MAC Address: 48 bits = 6 octets (bytes)\n\nFormat: XX:XX:XX:XX:XX:XX (hexadecimal)\n\nFlag Bits (first octet):\nBit 0 (LSB): 0 = Unicast, 1 = Multicast/Broadcast\nBit 1: 0 = Universally Administered (OUI-assigned), 1 = Locally Administered\n\nOUI (first 3 octets): manufacturer prefix (e.g., 00:1A:2B = Apple)\nNIC-specific (last 3 octets): unique per device\n\nTotal addresses: 2^48 ≈ 281 trillion\nLocal range: 48 bits, bit 1 of first octet = 1\n\nIEEE Registration: OUI costs ~$3,000; cheaper alternatives available for small manufacturers

Who Uses This Tool?

• Network engineers generating MAC addresses for lab testing and simulation
• Virtualization admins assigning MACs to VMs to avoid conflicts
• Privacy-conscious users randomizing MAC addresses (MAC spoofing)
• IoT developers generating device identifiers for provisioning and tracking
• Network security researchers testing MAC-based access controls and filters

Pro Tips

• For testing, use locally-administered MACs (second bit of first octet = 1, e.g., 02:00:00:... or 0A:00:00:...). These won't conflict with any real hardware
• Modern OSes (iOS 14+, Android 10+, Windows 10+) use MAC randomization by default when scanning for Wi-Fi networks. This is a privacy feature that makes MAC-based tracking harder
• MAC address filtering (whitelisting by MAC) provides very weak security — MACs can be spoofed in seconds. Don't rely on MAC filtering alone for network access control
• Virtualization platforms: VMware OUI = 00:50:56, VirtualBox = 08:00:27, Xen = 00:16:3E. Use these for realism but ensure no conflicts on the same network

Frequently Asked Questions about Mac Address Generator

Can two devices have the same MAC address?

Globally unique MACs (OUI-assigned) should never collide. However, locally-administered MACs (for VMs, privacy) can collide if manually assigned without care. On the same local network segment, duplicate MACs cause serious connectivity problems.

How do I check my device's MAC address?

Windows: ipconfig /all → 'Physical Address.' Mac/Linux: ifconfig or 'ip link show' → 'link/ether.' iOS: Settings → General → About → Wi-Fi Address. Android: Settings → About Phone → Status → Wi-Fi MAC address. Modern phones randomize Wi-Fi MACs periodically.

Free online Mac Address Generator — no signup, 100% client-side processing. All data stays in your browser.