Provided by: arp-scan_1.9-3_amd64 bug


       get-oui  -  Fetch  the arp-scan OUI file from the IEEE website (on Debian and Debian based
       systems, data is fetched from ieee-data package)


       get-oui [options]


       get-oui fetches the Ethernet OUI file from the IEEE website, and saves it  in  the  format
       used by arp-scan.

       The OUI file contains all of the OUIs (Organizationally Unique Identifiers) that have been
       registered with IEEE.  Each OUI entry in the file  specifies  the  first  24-bits  of  the
       48-bit Ethernet hardware address, leaving the remaining 24-bits for use by the registering
       organisation.  For example the OUI entry "080020", registered to Sun Microsystems, applies
       to  any  Ethernet  hardware address from 08:00:20:00:00:00 to 08:00:20:ff:ff:ff inclusive.
       Each OUI assignment represents a total of 2^24 (16,777,216) Ethernet addresses.

       Every major Ethernet hardware vendor registers an OUI  for  their  equipment,  and  larger
       vendors  will  need  to  register more than one.  For example, 3Com have a total of 37 OUI
       entries.  Organisations that only produce a small number of Ethernet  devices  will  often
       obtain an IAB registration instead.  See get-iab(1) for details.

       This  script  can be used to update the arp-scan OUI file from the latest data on the IEEE
       website.  Most of the Ethernet addresses in use belong to an OUI registration, so this  is
       the  most important of the files that arp-scan uses to decode Ethernet hardware addresses.
       You should therefore run get-oui occasionally to keep the arp-scan OUI file up to date.

       The OUI data is fetched from  the  URL  (on
       Debian  and  Debian  based systems, data is fetched from ieee-data package) and the output
       file is saved to the file ieee-oui.txt in the current directory. The URL to fetch the data
       from  can  be changed with the -u option, and the output file name can be changed with the
       -f option.

       The ieee-oui.txt file that is produced by this script is used by arp-scan to determine the
       Ethernet card vendor from its hardware address.

       The  directory  that  arp-scan  will look for the ieee-oui.txt file depends on the options
       used when it was built.  If it was built using the default options, then it will  look  in


       -h     Display a brief usage message and exit.

       -f <fn>
              Write the output to the specified file instead of the default ieee-oui.txt.

       -u <URL>
              Use  the  specified  URL  to  fetch  the  raw  OUI data from instead of the default
       (on  Debian   and   Debian   based
              systems, data is fetched from ieee-data package by default)

       -v     Display verbose progress messages.


              The default output file.


       $ get-oui -v
       Renaming ieee-oui.txt to ieee-oui.txt.bak
       Fetching OUI data from
       Fetched 1467278 bytes
       Opening output file ieee-oui.txt
       9274 OUI entries written to file ieee-oui.txt


       get-oui is implemented in Perl, so you need to have the Perl interpreter installed on your
       system to use it.

       get-oui uses the LWP::Simple Perl module to fetch the data from the IEEE website. You must
       have this module installed on your system for it to work. This module is available on most
       distributions, often called libwww-perl.  It is also available in source form from CPAN.

       You can use a proxy server by defining the http_proxy environment variable.


       Roy Hills <>




       arp-fingerprint(1) The arp-scan wiki page.

                                          March 30, 2007                               GET-OUI(1)