OUI

Another OIU lookup tool

Overview

The OUI Lookup Tool is a command-line application written in Go, mainly for myself to experiment with writing a Go application.

It fetches the OUI database directly from IEEE^[1] and caches it locally for offline lookups.

There are probably a million tools that do something similar, but I made this one.

Features

• Update OUI Database: Downloads the latest OUI data from IEEE and stores it locally.
• Lookup Manufacturer: Queries the local OUI database to find the manufacturer associated with a given MAC address prefix.

Installation

1. Clone the repository:

git clone https://github.com/aliask/oui.git
cd oui

2. Build the application:

go build
sudo cp oui /usr/local/bin

Usage

Update the OUI Database

Before looking up any MAC addresses, you need to acquire the OUI database:

oui update

This command downloads the latest OUI data from IEEE and stores it locally in your user configuration directory.

Lookup a Manufacturer

To lookup the manufacturer for a given MAC address, use the lookup command followed by the MAC address:

oui [lookup] ${MAC}

If lookup is omitted, the argument is assumed to be a MAC address.

Examples

aliask:~$ oui lookup 00:1A:2B:3C:4D:5E
Manufacturer for OUI 00:1A:2B:3C:4D:5E is: Ayecom Technology Co., Ltd.

aliask:~$ oiu 00-24-E8
Manufacturer for OUI 00-24-E8 is: Dell Inc.

aliask:~$ oiu lookup 00307E
Manufacturer for OUI 00307E is: Redflex Communication Systems

This command will output the manufacturer associated with the given MAC address prefix.

Implementation Details

• Database Storage: The OUI database is stored in the user's configuration directory (typically ~/.config/oui_data.csv).
• Data Format: The database is stored in CSV format, which is downloaded directly from the IEEE website.
• Input Validation: The tool ensures the provided MAC address is valid and conforms to one of the expected formats.