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Random MAC Address Generator

Generate RFC-friendly locally-administered MAC addresses in colon, dash, Cisco-dot, or bare format

Count:
Separator:
Input
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Output

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What is Random MAC Address Generator

Last reviewed:

Random MAC Address Generator mints MAC-48 addresses with the locally-administered bit set (second-least significant of the first byte), so they won't collide with real IEEE-assigned addresses.

Choose from colon, dash, Cisco-style dot, or bare output to match your tooling.

Why use it

  • Seed networking labs with safe MAC addresses.
  • Fixture DHCP / ARP tests.
  • Prototype inventory UIs without real devices.
  • Teach MAC address notation.
  • Validate format parsers.

Features

  • Locally-administered bit set
  • Colon / dash / dot / bare
  • Uppercase hex
  • Up to 1,000 per batch
  • Random MAC Address never leaves your machine

How to use Random MAC Address Generator

  1. Pick separator. Colon, dash, Cisco dot, or bare.
  2. Set count. Up to 1,000 addresses.
  3. Run. Copy the list.

Example (before/after)

Input

3

Output (separator=colon, count=3)

02:A3:7F:11:C4:89
1A:B5:0C:D7:E2:46
3E:91:2D:7A:F8:50

Common errors

Multicast bit

Bit 0 of the first byte marks multicast.

Fix: This tool always sets locally-administered and keeps unicast.

Collision risk

MAC addresses can theoretically collide.

Fix: Use only in test environments — not production.

FAQ

Are these safe to use in labs?

Yes — the locally-administered bit is always set.

Which separators are supported?

Colon (`:`), dash (`-`), Cisco dot (`.`), and bare.

Is the case uppercase?

Yes — uppercase hex is more readable in lab output.

How many per batch?

Up to 1,000 addresses.

Is input uploaded?

No — MAC addresses are assembled from local RNG bytes and stay on this device.

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