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MAC address generator

Generate cryptographically random MAC addresses with prefix, local/multicast flags, and formatting.

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Using this tool

Generate random MAC candidates for test configuration.

Actions: Generate MAC

Example

The local bit overrides the first byte, changing 00 to 02. The final three bytes vary; XX/YY are placeholders.

Example action and settings

Action: Generate MAC
Count: 2
Optional prefix (1–5 bytes): 00:11:22
Locally administered: On
Multicast: Off
Format: Colon-separated
Lowercase: Off

Input / action

Result / expected behavior
02:11:22:XX:XX:XX
02:11:22:YY:YY:YY (random bytes; placeholders are not literal output).
Available options: Count · Optional prefix (1–5 bytes) · Locally administered · Multicast · Lowercase · Format
Scope and limitations
  • Each batch contains 1–1000 addresses; prefixes contain 1–5 complete bytes.
  • No local-network collision detection is performed.
Common mistakes
  • Do not assume the prefix is preserved exactly: checkboxes override its local and multicast bits.
Related tools
MAC address lookup  IPv6 ULA generator  
Privacy and browser support
Input is processed in this browser. Do not use real keys or active sensitive credentials as demonstration data. Device features require browser support and your permission.