Random MAC Address Generator

Quickly generate random MAC addresses, with support for batch generation, multiple separators, and uppercase/lowercase formats, and copy/export functionality

Bug report

Browser execution mode: Your data is processed in your browser and is not uploaded to the server.

Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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If the online tool fails to load or run, try the desktop tool.https://tools.yikeaigc.com/

Tool Usage

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Set generation rules first, then generate, copy, or export addresses.

Suitable for network testing, VM setup, development mock data, and bulk samples. A fixed prefix keeps the prefix's address type.

Random OUI Prefix TXT / CSV / JSON Save Settings

Format Example Locally Administered Unicast

A2:1B:3C:4D:5E:6FColon

A2-1B-3C-4D-5E-6FHyphen

A21B.3C4D.5E6FCisco

Parameters

Tip: generate samples with “Locally Administered Unicast” first. To simulate a vendor or virtualization platform, use a fixed prefix.

Quantity Generate 1 to 10000 addresses. The results area previews the first 300 records.

Address Type Locally Administered Unicast is best for testing and virtual networks.

Prefix Source A fixed prefix generates the remaining bytes, ideal for bulk simulation of similar devices.

Custom Prefix Supports 1 to 5 hex byte groups; separators can be mixed.

Output Format Choose a format for Windows, Linux, or switch configuration habits.

Letter case Only changes display case, not address meaning.

Suffix policy Incremental suffixes are good for continuous test samples.

Preview mode Export buttons can still download TXT, CSV, or JSON separately.

Line breaks Windows scripts can use CRLF.

Avoid duplicates Exclude all 0 and all F Auto-copy after generating

Results

Address count0

Deduped count0

Address Type-

First 3 bytes-

Waiting to generateSet the parameters first, then click “Generate results”.

Locally administered address The U/L bit of the first byte is 1, usually used for VMs, test environments, or manually assigned addresses.

Unicast and multicast An I/G bit of 0 in the first byte means unicast; 1 means multicast. For normal device tests, choose unicast.

Fixed prefix After choosing a vendor or custom prefix, the tool only randomizes or increments the remaining bytes to create samples in the same range.

Instructions

Software Usage Instructions

Set the quantity to generate: Enter the number of MAC addresses you need to generate. Supports both small test samples and bulk address lists.
Select the address type:
- Locally administered unicast: Suitable for virtual machines, test networks, and development mock data.
- Globally administered unicast style: Generates styled addresses based on globally administered bits; does not represent real vendor assignments.
- Locally administered multicast: Suitable for multicast rules, filters, or protocol learning samples.
- Fully random: Does not adjust the first-byte flag bits, generating freer random samples.
Set the prefix source: You can choose a random prefix, a common virtualization platform prefix, or enter a custom prefix. Custom prefixes support 1 to 5 groups of hexadecimal bytes.
Configure the output format: Choose colon, hyphen, dot, Cisco, space, or no separator format, and set uppercase or lowercase display.
Select the suffix strategy:
- Random suffix: Suitable for generating scattered test addresses.
- Incrementing suffix: Suitable for generating sequential samples, making script or spreadsheet verification easier.
Generate and view results: Click “Next: Generate Results”. The tool will generate MAC addresses according to the parameters and display a preview. When there are many records, only the first 300 are previewed, while copy and download still include all results.
Copy or export: You can copy all results or download TXT, CSV, or JSON files; for frequently used configurations, click “Save Settings” for easier use next time.

FAQ

A: Locally administered unicast is commonly used for test networks, virtual machines, containers, lab environments, and development mock data. It indicates that the address is assigned by an administrator or software and is not used to claim a real vendor hardware address.

A: A random prefix generates a complete address according to the address type; a fixed prefix preserves the specified prefix and only fills in the following bytes, making it suitable for simulating samples from VMware, VirtualBox, Hyper-V, QEMU, or a specified vendor range.

A: You can enter 1 to 5 groups of hexadecimal bytes, such as A2:1B:3C, A2-1B-3C, or A21B3C. The tool automatically recognizes common separators and fills in the remaining bytes.

A: A MAC address has 6 byte groups. If the first 5 groups are fixed, only 1 byte group remains variable, which gives 256 combinations. When duplicate avoidance is enabled, the number generated cannot exceed the number of available combinations.

A: No. Colons, hyphens, Cisco format, spaces, and no separator are just different display styles; they still represent the same 48-bit MAC address. Choose the format based on your system, switch, or script requirements.

A: They are recommended mainly for testing, learning, development, and simulated data. Before using them on real network devices, confirm your address plan to avoid conflicts with existing devices or management policies.