December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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Appendix A
Vendor Ethernet/802.3 Prefixes
Ethernet/802.3 vendor prefixes are the first six (leftmost) hexadecimal digits of an Ether-
net/802.3 address. Vendor prefixes, officially called organizationally unique identifiers
(OUIs), are assigned by IEEE, which maintains a Web site of all publicly released OUI
assignments. (Not all organizations make their assigned prefixes public.) This Web site,
located at http://standards.ieee.org/regauth/oui/index.html, is updated quarterly. Note that
OUI assignments do not always match the original equipment manufacturer (OEM) of a
network interface. Some organizations elect to license their vendor codes to other manu-
facturers. In such cases, the prefix will reflect the OEM and not the IEEE assignment. For
example, the ...
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