What formats of MAC addresses does the tool support?

The tool supports all common MAC address formats, including colon-separated (00:1A:2B:3C:4D:5E), hyphen-separated (00-1A-2B-3C-4D-5E), Cisco dot notation (001a.2b3c.4d5e), and raw hexadecimal strings.

What is the difference between UAA and locally administered MAC addresses?

A Universally Administered Address (UAA) is globally unique and assigned by the IEEE to the manufacturer. A locally administered address is generated by software (like VMs or mobile MAC randomization) and will not appear in the IEEE OUI database.

Does this tool require an active internet connection?

No, the tool runs entirely offline in your browser using a bundled copy of the IEEE OUI database containing over 39,000 registered blocks.

Why does a valid MAC address show as 'not found' or unknown vendor?

This usually happens if the MAC address is locally administered (randomized), or if it belongs to a newer small-block allocation (MA-M, MA-S, or IAB) that falls outside the classic 24-bit OUI prefix matching.

How many results can I retrieve when reverse-searching by company name?

You can configure the tool to return up to 500 matching OUI blocks per search, grouped by the registered organization name.

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MAC OUI Vendor Lookup

Look up the manufacturer of a MAC address from the IEEE OUI database, or reverse-search a company name to list all its OUI blocks — fully offline

Details

What this tool helps you do

Two modes against a bundled offline copy of the IEEE OUI database (39,227 OUI blocks): (1) MAC address → vendor — parses any common format, decodes the OUI, shows the registered organization/address and the address type (UAA / locally administered / multicast) from the U/L and I/G bits, plus format conversions; (2) Company name → OUI list — tokenized reverse search returning all OUI blocks registered to matching organizations, grouped by company.

Execution

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Prepared example runs

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2 examples

Look up the vendor of a single MAC address

Normalize the input, decode the OUI, and show the registered organization from the IEEE database.

<div>MAC OUI vendor lookup result with address type and format conversions.</div>

Reverse-search all OUI blocks owned by a company

Enter a company name and list every OUI block registered to matching organizations.

<div>Reverse lookup grouped by organization with all matching OUI blocks.</div>

Inputs

Set the required fields, then run the tool.

3 options

ContentPaste or type the main input values.1

InputtextRequired

SettingsAdjust formats, ranges, numbers, and modes.2

Lookup ModeselectOptionalMax reverse resultsnumberOptional

Result

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Samples

MAC OUI Vendor Lookup

What this tool helps you do

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Identify the Manufacturer of a Network Device

2. Find All OUI Blocks Registered to Apple

FAQ

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