BYTETOOLS

MAC Address Generator

Generate random MAC addresses online. Choose colon or hyphen separators, uppercase or lowercase, and how many. Fast, valid test data, fully private.

What is the MAC Address Generator?

The ByteTools MAC Address Generator creates random 48-bit MAC addresses for testing, labelling and sample data.

  • Random, valid 48-bit MAC addresses
  • Colon or hyphen separator options
  • Uppercase or lowercase hex output
  • Locally-administered bit set to avoid real vendors
  • Generate one address or a large batch
  • Copy the list — 100% local and private

How to use the MAC Address Generator

  1. 1

    Choose the separator: colon (:) or hyphen (-).

  2. 2

    Pick uppercase or lowercase hexadecimal.

  3. 3

    Set how many MAC addresses to generate.

  4. 4

    Click Generate to build the list.

  5. 5

    Copy the addresses for your configs or test data.

About the MAC Address Generator

The ByteTools MAC Address Generator creates random 48-bit MAC addresses for testing, labelling and sample data. Choose your separator — colons or hyphens — pick uppercase or lowercase hex, set how many you need, and copy the list in one click.

It is useful for developers and network engineers seeding device inventories, building test fixtures, populating DHCP and firewall configs, and demonstrating tools without exposing real hardware identifiers. Generated addresses use the locally-administered bit so they cannot collide with a real manufacturer's assigned range.

Every address is produced locally in your browser with a cryptographically secure random source. Nothing is uploaded or logged, so you can generate as many MAC addresses as you want, privately and instantly.

Frequently asked questions

What is a MAC address?

A MAC (Media Access Control) address is a 48-bit hardware identifier assigned to a network interface, written as six pairs of hex digits like 3C:5A:B4:0F:12:9E. It identifies a device on a local network, separately from its IP address.

Are these random MAC addresses safe to use?

They are intended as test data. The generator sets the locally-administered bit and clears the multicast bit, producing valid unicast addresses that fall outside any manufacturer's assigned range, so they will not clash with real vendor OUIs.

What separator should I use, colon or hyphen?

Both are valid. Colons (3C:5A:B4:...) are common on Linux and macOS, while hyphens (3C-5A-B4-...) are the traditional Windows style. Choose whichever matches the system you are configuring or testing.

Can I generate uppercase or lowercase MAC addresses?

Yes. A single toggle switches the hex digits between uppercase and lowercase. The value is identical either way; case is purely cosmetic and depends on your tool or style preference.

How many MAC addresses can I create at once?

You can generate a whole batch in one click. Since everything runs locally in your browser, large lists generate instantly and none of the addresses are uploaded or stored anywhere.

Guides for MAC Address Generator

Related tools