A & R Cambridge (Arcam) — OUI 00:1B:7C (MA-L)

The OUI prefix 00:1B:7C is registered to "A & R Cambridge" at Pembroke Avenue, Cambridge, England — the legal and original trading name of Arcam, a British hi-fi and home-cinema electronics manufacturer founded in 1976. This is a substantive registrant rather than a bare single-OUI shell: A&R Cambridge Ltd is a real, documented company (UK Companies House registration #02880174), with a Wikipedia entry, an active brand site, and a long consumer-electronics product history. Ownership passed to JAM Industries in 2012 and then to Samsung's Harman division in July 2017, where the Arcam brand continues. The Ethernet allocation is consistent with Arcam's networked AV hardware: its AV receivers and processors (the AVR/AV40 line) support IP/Ethernet control, and it has shipped dedicated network-streaming products such as the rPlay network music streamer and the rBlink wireless streaming device. Two data-quality caveats apply. First, the OUI-to-name mapping in this pass rests on a single third-party aggregator (maclookup.app); a direct primary read of IEEE's oui.txt was blocked (HTTP 418) and a second aggregator returned no usable data, so the prefix/name pairing is tagged Likely rather than Confirmed. Second, the "registration date" (20 Feb 2007) and "last updated" (17 Nov 2015) shown by that aggregator are database artifacts, not IEEE facts — IEEE publishes no OUI assignment or registration dates, so no date is recorded here. This appears to be a single-OUI registration (one unique prefix reported), not a multi-block footprint.

IEEE assignment

00-1B-7C → "A & R Cambridge" [Confirmed] — the IEEE MA-L registry (registry cache); prefix/name cross-check [Likely] — https://maclookup.app/vendors/a-r-cambridge

Registry / block size

MA-L (24-bit OUI). No matching MA-M (the IEEE MA-M registry) or MA-S (the IEEE MA-S registry) block for this org [Confirmed] — the IEEE MA-L registry

Registered address

Pembroke Avenue, Cambridge, CAMBS, GB CB25 9QR [Confirmed] — the IEEE MA-L registry

Company identity

"A & R Cambridge" is the legal/trading name of Arcam, UK hi-fi/AV manufacturer founded 1976 in Cambridge, England [Confirmed] — https://en.wikipedia.org/wiki/A%26R_Cambridge_Ltd, https://find-and-update.company-information.service.gov.uk/company/02880174 (Companies House #02880174)

Company status

active brand; ownership JAM Industries (2012) → Samsung/Harman (July 2017–present) [Confirmed] — https://en.wikipedia.org/wiki/A%26R_Cambridge_Ltd, https://www.arcam.co.uk/

Device types

IP/Ethernet-controllable AV receivers and processors (AVR / AV40 series); network streaming products (rPlay network music streamer, rBlink wireless streamer, rDock) [Confirmed] — https://www.arcam.co.uk/product,hda,av-processors,av40.htm, https://www.arcam.co.uk/ugc/tor/AV40/Custom%20Installation%20Notes/RS232_10_20_30_40__SH289E_D_29Oct20.pdf, https://www.arcam.co.uk/ugc/tor/rPlay/User%20Manual/DISPLAY_SH283_rPlay_EN-FR-DE-NL-ES-RU-IT-SC_Issue2_MP.pdf

Assignment date

Unknown — IEEE publishes no OUI assignment/registration dates; the registry cache has no date field for this record. The maclookup.app "20 Feb 2007" figure is a database artifact and is NOT recorded as an IEEE fact [Confirmed intent] — https://maclookup.app/vendors/a-r-cambridge

Multiple-block check

single-OUI registration likely — one unique MAC prefix reported by the aggregator; no other block found under this exact org name in the IEEE MA-L registry, the IEEE MA-M registry, or the IEEE MA-S registry [Likely] — the IEEE MA-L registry, https://maclookup.app/vendors/a-r-cambridge

Disambiguation

many unrelated "Cambridge"-named companies exist in the IEEE MA-L registry (Cambridge Industries(Group), Cambridge Mobile Telematics, Cambridge Consultants, Cambridge Silicon Radio, etc.) — none match "A & R Cambridge" and none were conflated [Confirmed] — the IEEE MA-L registry

IANA reference

N/A — OUI entries carry no IANA RFC reference; none fabricated

Primary IEEE confirmation

Unknown/not obtained — direct standards-oui.ieee.org/oui/oui.txt fetch returned HTTP 418 this pass; prefix/name pairing rests on one third-party aggregator plus the local registry cache [Unknown] — no primary source read this session