Thanks Bill, Dave, and Olin. I was a bit shocked when I saw the price tag though...US$1650. Ouch. And here I was just trying to make sure my hobbiest project won't conflict with some commercial hardware out there. Ah well, I emailed them to see if there is a testing, or local range, like 192.168.x.x in the IP world. We'll see what the response is. Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams William Chops Westfield wrote: > > Does anyone know how to apply for a MAC address prefix? I have searched > the web but can't seem to find anything pointing me in the direction of > someone to talk to. > > http://standards.ieee.org/regauth/oui/index.shtml > > It's called the "Organizationally Unique Identifier" (OUI) in official > circles. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.