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




NAME

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


SYNOPSIS

       get-oui [options]


DESCRIPTION

       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://stan-
       dards.ieee.org/regauth/oui/oui.txt  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.


OPTIONS

       -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 http://standards.ieee.org/regauth/oui/oui.txt.

       -v     Display verbose progress messages.


FILES

       ieee-oui.txt
              The default output file.


EXAMPLES

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


NOTES

       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::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 vari-
       able.


AUTHOR

       Roy Hills <Roy.Hills@nta-monitor.com>


SEE ALSO

       arp-scan(1)

       get-iab(1)

       arp-fingerprint(1)

       http://www.nta-monitor.com/wiki/ The arp-scan wiki page.



                                March 30, 2007                      get-oui(1)

arp-scan 1.9 - Generated Wed May 13 07:23:24 CDT 2015
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