MAC Address Lookup / Generator

Generate a random MAC address, or look up the likely vendor associated with a MAC address's prefix (OUI). Useful for testing, spoofing detection, or identifying a device on your network.

Generate a Random MAC Address

9C:71:BD:E9:3E:2D

Look Up a Vendor from a MAC Address

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Why use MAC Address Lookup?

This tool generates random, properly-formatted unicast MAC addresses for testing purposes, and can look up the likely vendor for a MAC address using its OUI (Organizationally Unique Identifier) prefix — the first three bytes, which IEEE assigns to manufacturers. The vendor lookup covers common consumer device brands rather than the full IEEE registry.

Key benefits

Generates valid, properly-formatted unicast MAC addresses
Vendor lookup for common consumer device manufacturers
Runs entirely in your browser

Features

Random MAC address generator with proper unicast bit handling
OUI-prefix-based vendor lookup

Popular use cases

Generating a test MAC address for network configuration or virtualization
Identifying the likely manufacturer of a device seen on your network
Learning how MAC address prefixes map to vendors

How to use MAC Address Lookup

1
Generate a MAC address
Click Generate New for a random, valid, unicast MAC address.
2
Or look up a vendor
Paste a MAC address and click Look Up Vendor to see its likely manufacturer.

Frequently asked questions

Does the vendor lookup cover every manufacturer?

No — it covers a curated list of common consumer device vendors, not the full IEEE OUI registry, which has tens of thousands of entries. An unmatched prefix doesn't mean the device has no real vendor, just that it isn't in this shorter list.

Is the generated MAC address guaranteed to be unique?

It's randomly generated and not checked against any registry, so while collisions are extremely unlikely, it's not guaranteed globally unique — appropriate for testing, not for assigning to production hardware.

What does "locally administered" mean?

A bit in the MAC address that marks it as manually assigned rather than factory-set by a vendor — this generator produces standard vendor-style addresses by default.

Last reviewed: July 2026

Generate a Random MAC Address

Look Up a Vendor from a MAC Address

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