MAC Address Generator
Common Manufacturer OUIs
How to Use
- Select the desired format (colon, hyphen, Cisco, none)
- Choose uppercase or lowercase
- Set the quantity of addresses to generate
- Optionally set a prefix (OUI) for specific vendor simulation
- Select unicast or multicast, and local administration if needed
- Click "Generate MAC Addresses"
- Click any address to copy, or "Copy All"
Use Cases
- Network testing - Test switches, routers, and firewalls
- Virtual machines - Assign MACs to VMs and containers
- Development - Test network-related application features
- Database seeding - Generate test data with MAC addresses
- Documentation - Use as examples in technical docs
- Lab environments - Set up network labs safely
Frequently Asked Questions
What is a MAC address?
A MAC (Media Access Control) address is a unique 48-bit hardware identifier assigned to network interfaces. It's used for communication within a network segment.
Are generated MAC addresses unique?
Generated addresses are random and statistically unique but not globally registered. Real MAC addresses are assigned by manufacturers through the IEEE.
What do the different parts of a MAC address mean?
The first 3 bytes (OUI) identify the manufacturer. The last 3 bytes are device-specific. The first byte's LSB indicates unicast (0) or multicast (1).
What are common MAC address formats?
Common formats include colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated (AA-BB-CC-DD-EE-FF), and dot-separated (AABB.CCDD.EEFF) used by Cisco.
What are locally administered addresses?
Locally administered addresses have their second-least-significant bit set to 1 (like x2:xx:xx:xx:xx:xx), indicating they're self-assigned rather than manufacturer-assigned.