What is a MAC address?

A MAC (Media Access Control) address is a unique 48-bit hardware identifier assigned to network interface controllers (NICs). It consists of 6 bytes (octets) typically displayed as hexadecimal pairs separated by colons, dashes, or dots. MAC addresses operate at the data link layer (Layer 2) of the OSI model.

Are the generated MAC addresses truly random?

Yes, each byte of the MAC address is generated using JavaScript's Math.random() function, producing pseudo-random values. The first octet can be modified based on your unicast and locally administered settings to ensure valid flag bits.

What does 'unicast only' mean?

The least significant bit (bit 0) of the first octet determines whether an address is unicast (0) or multicast (1). Enabling 'unicast only' clears this bit, ensuring the address targets a single network interface rather than a group of devices.

What is a locally administered MAC address?

A locally administered address has bit 1 of the first octet set to 1, indicating it was assigned by a network administrator or software rather than by the hardware manufacturer. This is commonly used for virtual machines, containers, and privacy-focused MAC randomization.

Which MAC format should I use?

Use colon-separated (AA:BB:CC:DD:EE:FF) for Linux/macOS and most networking tools. Use dash-separated (AA-BB-CC-DD-EE-FF) for Windows environments. Use Cisco dot notation (AABB.CCDD.EEFF) for Cisco router and switch configurations.

Can I use these MAC addresses on real network devices?

Yes, but use the 'locally administered' option to set the appropriate flag bit. This prevents conflicts with manufacturer-assigned (globally unique) MAC addresses. Note that changing a device's MAC address may violate network policies or terms of service.

How many MAC addresses can I generate at once?

You can generate between 1 and 50 MAC addresses in a single batch. All generation happens instantly in your browser — no server requests are made, and your generated addresses remain completely private.

Is my data private and secure?

Yes, all MAC address generation happens locally in your browser using JavaScript. No data is sent to any server, and your generated addresses are never stored or transmitted. You can use this tool with complete confidence in your privacy.

Random MAC Address Generator

Generate random MAC addresses with configurable separator formats (colon, dash, Cisco dot notation), case options, and unicast/locally-administered flags for network testing, software development, and lab environments.

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Quick Presets

Common MAC address generation presets

MAC Address Options

Configure format and generation settings

Count

Number of MAC addresses to generate (1-50)

Separator Format

ColonAA:BB:CC:DD:EE:FFDashAA-BB-CC-DD-EE-FFDot/CiscoAABB.CCDD.EEFF

Case

UppercaseAA:BB:CC:DD:EE:FFLowercaseaa:bb:cc:dd:ee:ff

Unicast only

Ensure the first octet has bit 0 cleared (even number) for unicast addresses

Locally administered

Set bit 1 of the first octet to mark as locally administered

How it works: A MAC (Media Access Control) address is a 48-bit hardware identifier represented as 6 pairs of hexadecimal digits. The first octet controls unicast/multicast (bit 0) and globally unique/locally administered (bit 1) flags. This tool generates random bytes and formats them with your chosen separator and case preferences.

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