HDMI Licensing, LLC MAC Prefixes: Registry Assignment, Device Unknown

A MAC address beginning 44:48:91 or 00:0C:03 matches an IEEE MA-L assignment to HDMI Licensing, LLC; the match does not identify a device category. The supplied company material describes HDMI Licensing, LLC as the agent responsible for licensing the HDMI specification and promoting HDMI technology. It also says the company was a wholly owned subsidiary of Silicon Image, Inc., and that the HDMI specification was developed for consumer electronics and personal computer markets.

The same page reports that HDMI Licensing, LLC announced availability of HDMI 1.4 to adopters on June 8, 2009, with Ethernet connectivity and an Audio Return Channel among its features. It also describes HDMI Licensing Administrator, Inc. as licensing agent for HDMI Specification versions, but does not establish that entity’s legal or historical relationship to HDMI Licensing, LLC.

Each listed prefix is 24 bits long, leaving 24 suffix bits and 16,777,216 mathematically possible suffix values per prefix. That is an address-space count, not a count of devices or shipments. Both prefixes have Group bit 0 and Local bit 0 in the first octet, so each exact literal prefix fixes those bits. Changing either bit changes the prefix match.

A matching captured address supports an assignment match only; it does not establish a specific product, device, operating system, deployment, or security state.

Registry match

44:48:91 and 00:0C:03 are assigned to HDMI Licensing, LLC in MA-L.

Device identification

Unknown; the supplied sources do not map either exact prefix to a device category.

Address interpretation

Each is a 24-bit prefix with 24 suffix bits; both have Group bit 0 and Local bit 0.

What a match establishes

The address matches a registry assignment, not a particular device, product, or deployment.

Company

HDMI Licensing, LLC [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Registry

MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Prefixes

44:48:91, 00:0C:03 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Country

United States [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Industry

HDMI interface specification licensing; consumer electronics and personal computer interface standard [Confirmed] — https://www.hdmi.org/press/bodydetails/45

Notable products

HDMI specification; HDMI 1.4 technology specification [Confirmed] — https://www.hdmi.org/press/bodydetails/45

Related vendor

Silicon Image, Inc. [Confirmed] — https://www.hdmi.org/press/bodydetails/45

Device types

Unknown; no device category is mapped to these exact prefixes [Unknown] — https://standards-oui.ieee.org/oui/oui.csv

Assignment dates

Assignment dates are unavailable in these IEEE CSV records. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv