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get-oui(1)                                                          get-oui(1)


       get-oui - Fetch the arp-scan OUI file from the IEEE website


       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  Identi-
       fiers) 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 equip-
       ment, 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 there-
       fore run get-oui occasionally to keep the arp-scan OUI file up to date.

       The   OUI   data   is   fetched   from   the   URL    http://standards- 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 /usr/local/share/arp-scan.


       -h     Display a brief usage message and exit.

       -f <fn>
              Write  the  output  to the specified file instead of the default

       -u <URL>
              Use the specified URL to fetch the raw OUI data from instead  of
              the 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 3467133 bytes
       Opening output file ieee-oui.txt
       22402 OUI entries written to file ieee-oui.txt


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

       get-oui uses the LWP::UserAgent 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 vari-


       Roy Hills <>




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

                                August 13, 2016                     get-oui(1)

arp-scan 1.9.6 - Generated Sun Nov 3 07:18:40 CST 2019
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