Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!tut.cis.ohio-state.edu!ucbvax!ultra.UUCP!beau
From: beau@ultra.UUCP (Beau James {Manager-SW Development-Ultra Network Tech.})
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  Ethernet Addresses?
Message-ID: <8903152131.AA29367@hal.ultra.Ultra.COM>
Date: 15 Mar 89 21:31:10 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 25


	Can someone tell me if there is some sort of list that says what
	manufacturer uses what ethernet addresses?  I have noticed that
	for the most part all suns have a leading 8:0:20:?:?:? and that
	other machines do the same.  What I am looking for is a list that
	will give some indication as to what type of machine it might be
	by just looking at the ethernet address.

The official list is maintained by Xerox.  Every vendor who makes
Ethernet interfaces is supposed to apply to Xerox for a range of
Ethernet numbers, which the vendor then assigns uniquely to each
new controller built.  If everyone follows the rules, then all
Ethernet addresses will be unique.

Unfortunately, some systems assign the Ethernet address in software,
or allow you to override the Ethernet address assigned to the
controller.  So global uniqueness is not guaranteed in practice,
even when the vendors followed the rules.

I don't know the contact address at Xerox, but the information
is included in the DEC-Intel-Xerox Ethernet spec documents, if
you can locate one of those.

Beau James					beau@ultra.COM
Ultra Network Technologies