Re: Duplicate MAC prefixes in nmap-mac-prefixes

[Fyodor <fyodor () insecure org>]

On Wed, Nov 11, 2009 at 09:58:47PM +0000, DePriest, Jason R. wrote:
> I know this isn't unique to nmap.
>
> What is the benefit of the IEEE assigning multiple vendors to the same
> vendor prefix?

I'm guessing it is an accident.  Out of more than 13,000 assignments,
only the two that David mentioned have duplicates.  You can see them
in the original file (http://standards.ieee.org/regauth/oui/oui.txt), like:

00-01-C8   (hex)                THOMAS CONRAD CORP.
0001C8     (base 16)            THOMAS CONRAD CORP.
                                1908-R KRAMER LANE
                                AUSTIN TX 78758
                                UNITED STATES

00-01-C8   (hex)                CONRAD CORP.
0001C8     (base 16)            CONRAD CORP.

> It doesn't make sense that something that is supposed to be unique by
> vendor isn't actually unique by vendor.

Someone on nmap-dev posted about how he was able to get the IEEE to
change the oui.txt file to use consistent capitalization for a certain
company earlier this year.  So it is possible that if someone contacts
the IEEE, they can get these duplicates removed too.

Cheers,
-F
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