get-iab - Fetch the arp-scan IAB file from the IEEE website
get-iab fetches the Ethernet IAB file from the IEEE website, and saves
it in the format used by arp-scan.
The IAB file contains all of the IABs (Individual Address Blocks) that
have been registered with IEEE. Each IAB entry in the file specifies
the first 36-bits of the 48-bit Ethernet hardware address, leaving the
remaining 12-bits for use by the registering organisation. For example
the IAB entry "0050C2003", registered to Microsoft, applies to any
Ethernet hardware address from 00:50:c2:00:30:00 to 00:50:c2:00:3f:ff
inclusive. Each IAB assignment represents a total of 2^12 (4,096)
Major Ethernet hardware vendors typically use an OUI registration
rather than an IAB registration. See get-oui(1) for details.
This script can be used to update the arp-scan IAB file from the latest
data on the IEEE website. It is relatively rare to see Ethernet
addresses from IAB registrations, so the IAB file is not as important
as the OUI file.
The IAB data is fetched from the URL
http://standards.ieee.org/regauth/oui/iab.txt and the output file is
saved to the file ieee-iab.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-iab.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-iab.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.
Write the output to the specified file instead of the default
Use the specified URL to fetch the raw IAB data from instead of
the default http://standards.ieee.org/regauth/oui/iab.txt
-v Display verbose progress messages.
The default output file.
$ get-iab -v
Renaming ieee-iab.txt to ieee-iab.txt.bak
Fetching IAB data from http://standards.ieee.org/regauth/oui/iab.txt
Fetched 230786 bytes
Opening output file ieee-iab.txt
1535 IAB entries written to file ieee-iab.txt
get-iab is implemented in Perl, so you need to have the Perl
interpreter installed on your system to use it.
get-iab 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
Roy Hills <Roy.Hills@nta-monitor.com>
http://www.nta-monitor.com/wiki/ The arp-scan wiki page.
March 30, 2007