Command line tool to lookup the manufacturer (OUI) associated with a MAC address
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.


This is a simple command line tool to lookup the equipment maker associated with a MAC address. The first three octets of a MAC address is the "Organizationally Unique Identifier" (OUI) and is registered with the IEEE.


A typical use of this tool is to lookup what kind of device is assocaited with a MAC address on the network. For example, suppose you use 'arp' and notice that you see a device on your network in the pool of addresses you reserve for DHCP addresses and you'd like to know what kind of device it is. Example:

gherlein@jupiter:~$ ouilookup d0:e1:40:b4:0e:6a
d0:e1:40:b4:0e:6d   Apple, Inc.    

Nothing special - just a fast way to see what kind of device is associated with that address.

Installation from Code

To compile and build:

go get
cd $GOPATH/src/
sudo make install

If you look at the makefile you will see that it downloads the latest OUI database textfile and installs it on your system as part of the install. This Makefile uses a trick to embed the installed location of that file into the code so that thre's no disconnect if you change the location. This trick uses -ldflags to pass in a variable:

go build -ldflags "-X main.oui_db=${OUI_DB_DIR}/${OUI_DB}"


Uses the excellent OUI Library by Klaus Post.


Organizationally Unique Identifier - Wikipedia


This project is released under the MIT License. Please see details [here] (