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Greetings! I am posting this in case anyone else is developing their own hardware products for Industrial Ethernet, and wants to obtain an official block of addresses (2 ^ 24, or 16,777,216 unique MACs). Here are the relevant URLs: Overview: http://standards.ieee.org/regauth/oui/forms/ Request Form: http://standards.ieee.org/regauth/oui/forms/OUI-form1.html The cost to obtain an "Organizationally Unique Identifier" (OUI) is $1,250.00. Regards, Willy Smith Costa Rica