# MAC Address Lookup Guide

Look up the vendor behind a MAC address OUI.

- Tool: https://ilham.dev/tools/mac-address-lookup/
- Guide URL: https://ilham.dev/guides/mac-address-lookup/
- Tool guides index: https://ilham.dev/guides/tools/
- Broader guide: Network Debugging Notes (https://ilham.dev/guides/network-debugging/)

## What it does

Look up the vendor registered to a MAC address's OUI — its first three octets — against the bundled IEEE registry.

## Use the tool

Open https://ilham.dev/tools/mac-address-lookup/, add the input the tool asks for, run it, and check the output before using it elsewhere.

## Input and output

- Input: text.
- Output: text.
- Category: Network.

## Privacy and processing
Processing happens locally in your browser. This tool does not upload the input to ilham.dev.

## Questions

### Why does a lookup return nothing?

Virtual machines and randomised addresses do not come from a registered OUI. Most phones now randomise their MAC per network, so a vendor lookup is often meaningless on modern hardware.