MACアドレスを引数に指定するとOUIベンダコードを検索するスクリプト (クエリ先： http://standards.ieee.org/develop/regauth/oui/public.html )

ouisearch.rb

#!/usr/bin/env ruby

require "net/http"

query_url = 'http://standards.ieee.org/cgi-bin/ouisearch'

irregular = {
  "080027" => "VirtualBox Guest",
  "525400" => "QEMU/KVM Guest",
}

def help
  printf "usage: %s MAC_ADDRESS\n", $0
  exit
end

if ARGV.length != 1 then
  help
end

mac = ARGV[0].gsub(/[\.\:\-]/,'').downcase

if /^([\da-f]{6})/ =~ mac then
  code = $1

  uri = URI.parse(query_url)
  resp, body = Net::HTTP.post_form(uri, :x => code)

  if /no match for the query/ =~ body then
    printf "The public OUI listing contains no match for the query %s\n", code
  else
    puts body.gsub(/\A.*\<pre\>|\<\/pre\>.*\Z|\<[a-z\/\s]+\>/m,'')
  end

  if irregular.has_key?(code) then
    printf "\n\t\t(may be: %s)\n", irregular[code]
  end
else
  help
end

実行例

$ ./ouisearch 08:00:27:1a:2b:3c
  08-00-27   (hex)  	CADMUS COMPUTER SYSTEMS
  080027     (base 16)		CADMUS COMPUTER SYSTEMS
  				600 SUFFOLK ST
				LOWELL MA 08154
				UNITED STATES

		(may be: VirtualBox Guest)
$