I periodically update my OUI database, I have a program that watches the
DHCP server and looks up the OUI manufacturer information from the MAC
address.

Last time I updated, which I think was something about a year ago, Apple
had about 160 OIDs.  At 16 million machines per OUI, that's a lot of
potential hardware out there.  Microsoft had 16, not being a major hardware
manufacturer.

As of today, Apple has 328 OUIs and Microsoft is up to 22.

Don't worry, the world isn't running out of OUIs any time soon.  We've used
up 1.1% of the total number available.

If you're interested, the text file from the IEEE is
http://standards.ieee.org/develop/regauth/oui/oui.txt

Curt

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