BYD Precision Manufacture — 4 prefixes (MA-L); EMS/ODM, OUI ≠ brand on the box

BYD Precision Manufacture holds four IEEE MA-L blocks — BC:23:92, 90:20:3A, 98:BB:1E, and 18:3B:D2 — under two slightly different registrant spellings that resolve to the same legal entity: "BYD Precision Manufacture Company Ltd." (BC:23:92, 98:BB:1E, 18:3B:D2) and "BYD Precision Manufacture Co.,Ltd" (90:20:3A). The registered addresses cluster in two locations: Shenzhen, Guangdong (BC:23:92 in the Longgang/Baolong industrial zone; 90:20:3A at No.3009 BYD Road, Pingshan, 518118) and Shanghai's Pudong district (98:BB:1E and 18:3B:D2, both at No.3000 LongDong Avenue, 201203). This is the contract-manufacturing (EMS/ODM) arm of BYD Electronic (International) Co Ltd — Hong Kong-listed, ticker 00285 — itself a subsidiary of BYD Company, and distinct from BYD Auto (the electric-vehicle business). The FCC grantee code ZW9 maps 16 applications (2012–2023) to this manufacturer, dominated by tablet PCs but also covering a vehicle multimedia central control, a POS terminal, a multifunction display, and an HP-branded "Slate 6 VoiceTab Plus" — that HP unit is the giveaway: the OUI identifies who assembled the device, not the brand printed on the box. For triage, a BYD Precision OUI means "made by BYD's EMS arm," then classify by other signals (DHCP hostname, model strings, mDNS). IEEE publishes no assignment dates for these blocks, so none is stated.

IEEE assignment

4 MA-L blocks — BC:23:92, 98:BB:1E, 18:3B:D2 ("BYD Precision Manufacture Company Ltd.") and 90:20:3A ("BYD Precision Manufacture Co.,Ltd"); same legal entity, two registrant spellings [Confirmed] — IEEE MA-L

Registry / block size

MA-L (24-bit OUI), 4 prefixes total; no MA-M or MA-S entries [Confirmed] — IEEE MA-L (the IEEE MA-M registry, the IEEE MA-S registry)

HQ / country

CN (China). Two address clusters — Shenzhen, Guangdong (No.3009 BYD Road, Pingshan, 518118; Longgang/Baolong industrial zone, 518116) and Shanghai Pudong (No.3000 LongDong Avenue, 201203) [Confirmed] — IEEE MA-L

Company status

active; the EMS/ODM arm of BYD Electronic (International) Co Ltd (HK-listed, 00285), subsidiary of BYD Company, distinct from BYD Auto; ~165,000 employees; acquired several Jabil China manufacturing operations (definitive agreement 2023-09-26, completed 2023-12-29); part of the iPhone supply chain since 2024

[Confirmed] — byd-electronics.com, existing DONE entry /mac/vendor/byd-electronic/

Device types

tablets (primary — 14 of 16 FCC ZW9 applications are tablet PCs), smartphones, IoT, smart-home, game hardware, POS terminals, vehicle infotainment/multimedia, multifunction displays — assembled for other brands [Confirmed] — https://fccid.io/ZW9

FCC grantee

code ZW9; 16 applications 2012–2023; includes an HP-branded "Slate 6 VoiceTab Plus" (ZW9HSTNH-B406M, 2014-09-12), confirming the EMS/ODM "OUI ≠ brand" pattern [Confirmed] — https://fccid.io/ZW9

Wi-Fi Alliance

member (member page node/48510); no specific certified-device listings were accessible from the public page [Likely] — https://www.wi-fi.org/node/48510

Verified prefix sample

BC:23:92, 90:20:3A, 98:BB:1E, 18:3B:D2 [Confirmed] — IEEE MA-L, https://uic.io/en/mac/vendor/byd_precision_manufacture_co_ltd/

Assignment date

Unknown — IEEE publishes no registration dates for OUI/MA-L assignments; any "date registered" on third-party MAC lookup tools is a database artifact, not an IEEE fact. None recorded. [Unknown] — IEEE MA-L

Security context

no CVEs or known-exploited vulnerabilities found tied to these OUI prefixes or BYD Precision tablet/IoT devices. CVE-2024-46442 concerns the BYD ATTO3 vehicle head unit — a different product line under BYD Auto, not BYD Electronic/Precision Manufacture.

[Confirmed scope] — researcher review (no positive finding)

Special note

EMS/ODM "OUI ≠ brand" case. Two registrant spellings ("BYD Precision Manufacture Company Ltd." and "BYD Precision Manufacture Co.,Ltd") plus the parent "BYD COMPANY LIMITED" — alias for matching. Distinct from BYD Auto (EVs). IEEE publishes no assignment dates. [Confirmed]

Related vendors

BYD Electronic (parent EMS arm), BYD Company (ultimate parent), BYD Auto / BYD Semiconductor (siblings); peers Hon Hai/Foxconn, Luxshare, Jabil, Flex

Analyst note

A BYD Precision OUI identifies the contract manufacturer; the finished device is very often sold under a completely different consumer brand — treat as "made by BYD's EMS arm," then classify by other signals (DHCP hostname, model strings, mDNS).