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MAC address generator

Enter the quantity and prefix. MAC addresses will be generated in your chosen case (uppercase or lowercase)

How to Use

  1. Step 1: Enter the quantity of MAC addresses to generate.
  2. Step 2: Optionally enter a prefix (OUI) to generate addresses for a specific vendor.
  3. Step 3: Select the separator (colon, hyphen, or none).
  4. Step 4: Click Generate and copy the results.

Frequently Asked Questions

What is a MAC address used for?

MAC addresses uniquely identify devices on a local network at the data-link layer (Layer 2).

Can I generate multicast MAC addresses?

The generator creates unicast addresses by default. A MAC address is multicast if the LSB of the first byte is 1.

What is the difference between locally and globally administered MAC addresses?

Globally administered (UAA): unique OUI from IEEE, guarantees global uniqueness. Locally administered (LAA): second-least-significant bit of first byte set to 1, manually configured. LAA are used in VMs, containers, and network testing where global uniqueness is not required.

What are the uses of random MAC addresses in network testing?

Uses of random MAC addresses: network simulation (testing a DHCP server's ability to allocate a large number of addresses); switch MAC table stress testing; network isolation and virtualization environments (VMs need unique MACs); privacy protection (modern phones use randomized MACs when scanning for Wi-Fi); testing the security of MAC-based access controls. When generating, pay attention to the U/L bit to avoid conflicts with real devices.