GitHub - Ringmast4r/OUI-Master-Database: The most comprehensive MAC address manufacturer lookup database - 88,577+ vendors from IEEE, Nmap, Wireshark, and HDM Mac-Tracker. One master list to rule them all.

`> what_is_this`

ringmast4r@github:~$ cat oui-master-db.txt

  PURPOSE:        MAC address vendor lookup, the comprehensive way
  SCOPE:          Every IEEE registry + Wireshark + Nmap + HDM Mac-Tracker
  COVERAGE:       88,577 unique OUIs, 78,014 cross-validated entries
  FORMATS:        TXT, CSV, TSV, JSON, JSON-min, XML, SQLite, SQL, Kismet, Kismet.gz
  UPDATES:        First of every month via GitHub Actions
  USE CASES:      Wardriving | Network forensics | IoT discovery | Threat intel

  STATUS:         [ LIVE & AUTO-UPDATING ]

OUI = the first 3 bytes of a MAC address that identifies the manufacturer. Most lookup databases pick one source. We merged all of them.

`> stats --live`

METRIC	COUNT	NOTES
Total Unique OUIs	`88,577`	Deduplicated across 4 sources
Cross-Validated	`78,014`	Same OUI from multiple sources
IEEE Registry Total	`57,497`	MA-L + MA-M + MA-S + IAB + CID
Device Categories	`24`	Auto-classified
File Formats	`10`	TXT to SQLite
Monthly New OUIs	`~365`	IEEE assignments

`> growth --monthly`

%%{init: {'theme':'dark', 'themeVariables': {'xyChart': {'backgroundColor':'#00000000','plotColorPalette':'#1E40AF','titleColor':'#1E40AF','xAxisLabelColor':'#ffffff','yAxisLabelColor':'#ffffff'}}}}%%
xychart-beta
    title "OUI Count Growth (Last 3 Auto-Updates)"
    x-axis ["2026-03-12", "2026-04-01", "2026-05-01"]
    y-axis "Total OUIs" 87800 --> 88800
    bar [87970, 88212, 88577]
    line [87970, 88212, 88577]

+607 OUIs in ~7 weeks · IEEE assigns roughly 300-400 new vendors/month · Next refresh: first of next month

`> sources --breakdown`

%%{init: {'theme':'dark', 'themeVariables': {'pie1':'#1E40AF','pie2':'#3B82F6','pie3':'#60A5FA','pie4':'#93C5FD','pie5':'#FFD700','pie6':'#1E3A8A','pieTitleTextSize':'18px','pieLegendTextSize':'14px'}}}%%
pie showData
    title Where Each OUI Comes From
    "All 3 (IEEE+Wireshark+Nmap)" : 38512
    "IEEE only" : 17995
    "Wireshark only" : 17924
    "Nmap only" : 13159
    "IEEE + Wireshark" : 573
    "IEEE + Nmap" : 414

38,512 OUIs (43%) are confirmed by all three primary sources. The remaining single-source entries fill gaps that no individual database would catch on its own. That's the point.

Source Roster

ENTRIES	LICENSE	URL
`57,497`	Public Domain	standards-oui.ieee.org
`57,009`	GPLv2	wireshark.org
`52,085`	GPLv2 (mod.)	nmap-mac-prefixes
`57,611`	MIT	hdm/mac-tracker

`> registries --ieee`

%%{init: {'theme':'dark', 'themeVariables': {'pie1':'#1E40AF','pie2':'#3B82F6','pie3':'#60A5FA','pie4':'#93C5FD','pie5':'#FFD700','pieTitleTextSize':'18px','pieLegendTextSize':'14px'}}}%%
pie showData
    title IEEE Registry Distribution (57,497 entries)
    "MA-L (Large, ~16M each)" : 39345
    "MA-S (Small, ~4K each)" : 6991
    "MA-M (Medium, ~1M each)" : 6375
    "IAB (Individual Block)" : 4575
    "CID (Company ID)" : 211

REGISTRY	ENTRIES	BLOCK SIZE	TYPICAL USE
MA-L	`39,345`	24-bit (~16M MACs)	Large-scale manufacturers
MA-S	`6,991`	36-bit (~4K MACs)	IoT, niche hardware
MA-M	`6,375`	28-bit (~1M MACs)	Mid-volume vendors
IAB	`4,575`	Individual	Legacy individual blocks
CID	`211`	Company-only ID	Non-MAC company markers

`> classification --devices`

⚠ IEEE doesn't expose device category. Our classifier is a heuristic on company name + known-vendor lookups, so only 15,582 of 88,577 OUIs (17.6%) get a category. The remaining 72,995 stay Unclassified rather than guessed.

%%{init: {'theme':'dark', 'themeVariables': {'pie1':'#1E40AF','pie2':'#3B82F6','pie3':'#60A5FA','pie4':'#93C5FD','pie5':'#FFD700','pie6':'#1E3A8A','pie7':'#00D4FF','pie8':'#9FEF00','pie9':'#FF00FF','pie10':'#8B5CF6','pie11':'#FF6B6B','pie12':'#00FF88','pieTitleTextSize':'16px','pieLegendTextSize':'12px'}}}%%
pie showData
    title Classified Device Types (15,582 of 88,577)
    "Phone" : 6171
    "Router" : 2315
    "Computer" : 1611
    "Smart Home" : 1349
    "IoT" : 818
    "Automotive" : 441
    "Industrial" : 416
    "Switch" : 367
    "Storage" : 328
    "Medical" : 315
    "Camera" : 267
    "Other (12 cats)" : 1184

Full device-type table (24 categories)

CATEGORY	COUNT	CATEGORY	COUNT
Phone	`6,171`	TV	`199`
Router	`2,315`	Media Player	`168`
Computer	`1,611`	Gaming	`164`
Smart Home	`1,349`	VoIP	`143`
IoT	`818`	Appliance	`138`
Automotive	`441`	Printer	`113`
Industrial	`416`	Access Point	`59`
Switch	`367`	Server	`57`
Storage	`328`	Wearable	`51`
Medical	`315`	Audio	`35`
Camera	`267`	Modem	`27`
		Thermostat	`23`
		Tablet	`7`

`> demo --live`

Search by MAC address or manufacturer name. Runs entirely in your browser. No tracking.

`> example`

MAC Address:  3C:D9:2B:12:34:56
              └─OUI─┘ └─Device─┘

OUI:          3C:D9:2B
Manufacturer: Hewlett Packard
Device Type:  Computer
Country:      US
Registry:     MA-L
Sources:      IEEE + Wireshark + Nmap

Why this matters:

Identify rogue/unauthorized devices on your network
Categorize WiFi APs by vendor while wardriving
Discover IoT devices, cameras, printers across a subnet
Detect MAC spoofing (compare OUI registry vs claimed vendor)

`> ls LISTS/`

Direct Downloads

SIZE	BEST FOR	DOWNLOAD
minimal	`grep`/`awk`, legacy tools	master_oui.txt
full	Spreadsheets, dataframes	master_oui.csv
medium	Excel/Sheets (no quote issues)	master_oui.tsv
pretty	APIs, human-readable	master_oui.json
compact	Scripts, fast loading	master_oui.min.json
enterprise	Java, XSLT	master_oui.xml
indexed	Ready-to-query DB	master_oui.db
script	Postgres/MySQL/D1 import	import-to-d1.sql
text	Kismet wireless IDS	kismet_manuf.txt
compressed	Kismet drop-in install	kismet_manuf.txt.gz

Raw URLs (cron / curl friendly)

https://raw.githubusercontent.com/Ringmast4r/OUI-Master-Database/master/LISTS/master_oui.txt
https://raw.githubusercontent.com/Ringmast4r/OUI-Master-Database/master/LISTS/master_oui.csv
https://raw.githubusercontent.com/Ringmast4r/OUI-Master-Database/master/LISTS/master_oui.json
https://raw.githubusercontent.com/Ringmast4r/OUI-Master-Database/master/LISTS/master_oui.db

`> data_fields`

FIELD	TYPE	EXAMPLE
`oui`	string	`3C:D9:2B`
`manufacturer`	string	`Hewlett Packard`
`short_name`	string	`HP`
`registry`	enum	`MA-L`, `MA-M`, `MA-S`, `IAB`, `CID`
`device_type`	enum	`Router`, `Phone`, `Camera`, `IoT`, ...
`address`	string	`11445 Compaq Center Dr, Houston TX US`
`country`	iso2	`US`, `CN`, `DE`, `JP`
`registered_date`	date	`2012-05-15`
`sources`	array	`["IEEE","Wireshark","Nmap"]`

`> usage`

`python`

import json

with open('LISTS/master_oui.min.json') as f:
    db = json.load(f)

def lookup(mac):
    oui = mac[:8].upper()
    return db.get(oui, {'manufacturer': 'Unknown'})

print(lookup('00:00:0C:12:34:56'))
# {'manufacturer': 'Cisco Systems, Inc', 'device_type': 'Router', 'country': 'US'}

`node.js`

const db = require('./LISTS/master_oui.json');
const lookup = mac => db[mac.substring(0,8).toUpperCase()] || { manufacturer: 'Unknown' };
console.log(lookup('00:00:0C:12:34:56'));

`sqlite3`

sqlite3 LISTS/master_oui.db "SELECT * FROM oui_registry WHERE oui = '00:00:0C'"
sqlite3 LISTS/master_oui.db "SELECT device_type, COUNT(*) FROM oui_registry GROUP BY device_type ORDER BY 2 DESC"

`grep` (TXT)

grep "3CD92B" LISTS/master_oui.txt
grep -i "apple" LISTS/master_oui.txt | head

`curl` (one-liner)

curl -s https://raw.githubusercontent.com/Ringmast4r/OUI-Master-Database/master/LISTS/master_oui.txt | grep -i "00000C"

`> cli_tool`

Cross-platform Node.js CLI in CLI TOOL/ — works on Windows / Linux / macOS.

cd "CLI TOOL"
node oui-lookup.js --interactive          # Continuous lookup REPL
node oui-lookup.js 00:00:0C:12:34:56      # Single lookup
node oui-lookup.js --search cisco         # Search by manufacturer
node oui-lookup.js --wifi                 # Scan nearby WiFi + show vendors
node oui-lookup.js --bluetooth            # Scan BT devices + show vendors
node oui-lookup.js --arp                  # Local ARP table with vendors
node oui-lookup.js --stats                # Database statistics

FEATURE	WIN	LINUX	MAC
WiFi Scan	`netsh wlan`	`nmcli`	`airport`
Bluetooth	PowerShell	`bluetoothctl`	`system_profiler`
ARP Table	`arp -a`	`arp -a`	`arp -a`

`> generate --fresh`

git clone https://github.com/Ringmast4r/OUI-Master-Database.git
cd OUI-Master-Database
npm install

bash download-sources.sh        # Pulls IEEE + Wireshark + Nmap + HDM
node merge-oui-databases.js     # Merges into LISTS/master_oui.*

Windows: double-click update-database.bat.

`> update_schedule`

The repo auto-updates on a monthly cron via GitHub Actions:

.github/workflows/update.yml -> runs at 02:00 UTC on the 1st of each month

Why monthly and not weekly? IEEE assigns ~300-400 OUIs/month. Polling more often just generates churn for marginal freshness on a slow-moving registry.

To self-host updates:

0 0 1 * * cd /path/to/OUI-Master-Database && bash download-sources.sh && node merge-oui-databases.js

`> use_cases`

%%{init: {'theme':'dark', 'themeVariables': {'pie1':'#1E40AF','pie2':'#3B82F6','pie3':'#60A5FA','pie4':'#93C5FD','pie5':'#FFD700','pie6':'#9FEF00','pieTitleTextSize':'16px','pieLegendTextSize':'12px'}}}%%
pie showData
    title Who Uses This (and How)
    "Wardriving / WiFi mapping" : 30
    "Network forensics & IR" : 22
    "IoT / asset discovery" : 18
    "Threat intel pipelines" : 12
    "Educational / classroom" : 10
    "Spoofing detection" : 8

`> credits`

Combining four authoritative sources, with respect for each license:

IEEE Registration Authority · public domain · standards-oui.ieee.org
Wireshark Manufacturer DB · GPLv2 · wireshark.org
Nmap MAC Prefixes · modified GPLv2 · nmap.org
HDM Mac-Tracker · MIT · hdm/mac-tracker

This project is MIT — use commercially, modify, redistribute, embed in proprietary tools.

`> related_projects`

`> contributing`

Issues and PRs welcome. Most-wanted contributions:

Better device-type heuristics (we're at 17.6% classified; let's get to 30%+)
Country-code derivation from address strings
Additional authoritative sources beyond the current four
API wrapper libraries (Go, Rust, Ruby)

Last updated: 2026-05-01 · Total OUIs: 88,577 · Maintained by @Ringmast4r

Name		Name	Last commit message	Last commit date
Latest commit History 34 Commits
.github		.github
CLI TOOL		CLI TOOL
LISTS		LISTS
scripts		scripts
.gitignore		.gitignore
OUI Master Database.png		OUI Master Database.png
QUICK-START.md		QUICK-START.md
README.md		README.md
download-sources.sh		download-sources.sh
index.html		index.html
merge-oui-databases.js		merge-oui-databases.js
package-lock.json		package-lock.json
package.json		package.json
update-database.bat		update-database.bat

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Repository files navigation

`> what_is_this`

`> stats --live`

`> growth --monthly`

`> sources --breakdown`

Source Roster

`> registries --ieee`

`> classification --devices`

`> demo --live`

`> example`

`> ls LISTS/`

Direct Downloads

Raw URLs (cron / curl friendly)

`> data_fields`

`> usage`

`python`

`node.js`

`sqlite3`

`grep` (TXT)

`curl` (one-liner)

`> cli_tool`

`> generate --fresh`

`> update_schedule`

`> use_cases`

`> credits`

`> related_projects`

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> what_is_this

> stats --live

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> sources --breakdown

Source Roster

> registries --ieee

> classification --devices

> demo --live

> example

> ls LISTS/

Direct Downloads

Raw URLs (cron / curl friendly)

> data_fields

> usage

python

node.js

sqlite3

grep (TXT)

curl (one-liner)

> cli_tool

> generate --fresh

> update_schedule

> use_cases

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`> what_is_this`

`> stats --live`

`> growth --monthly`

`> sources --breakdown`

`> registries --ieee`

`> classification --devices`

`> demo --live`

`> example`

`> ls LISTS/`

`> data_fields`

`> usage`

`python`

`node.js`

`sqlite3`

`grep` (TXT)

`curl` (one-liner)

`> cli_tool`

`> generate --fresh`

`> update_schedule`

`> use_cases`

`> credits`

`> related_projects`

`> contributing`

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