NXP Semiconductor (Tianjin) LTD. — 23 prefixes (MA-L)

NXP Semiconductor (Tianjin) LTD. holds 23 IEEE MA-L blocks, all registered to the same entity at No.15 Xinghua Avenue, Xiqing Economic Development Area, Tianjin 300385, China. The Tianjin company is a wholly-owned subsidiary of NXP Semiconductors N.V. (Eindhoven, Netherlands), inherited through NXP's December 2015 acquisition of Freescale Semiconductor — the site began life as a Freescale foreign-invested packaging and test plant and has operated in Tianjin for roughly three decades. The facility does final IC test and packaging (including final test for the i.MX6ULZ applications processor) and is co-located with a 51%-owned design joint-venture, NXP Qiangxin (Tianjin) IC Design Co. Ltd., that works on MCU/MPU and SoC designs for automotive, IoT, and embedded markets. The 23-block footprint (~385M addresses) is consistent with factory-level MAC burning into high-volume embedded chips across NXP's networking-capable lines — Ethernet-bearing i.MX application processors, i.MX RT crossover MCUs, Kinetis/MCX wireless MCUs (BLE / 802.15.4), and QorIQ/Layerscape network processors. A standard data-quality caveat applies: third-party MAC lookup tools sometimes show a "registration date" for these prefixes (e.g. D4:19:F6 labelled 2021-08-31), but those are scraper artifacts from the public IEEE registry file — IEEE publishes no OUI assignment dates, so no such date should be presented as an IEEE fact.

IEEE assignment

23 prefixes → NXP Semiconductor (Tianjin) LTD., registered Tianjin, CN [Confirmed] — IEEE MA-L

Registry / block size

MA-L (24-bit OUI); 23 IEEE prefixes (~385M addresses); no MA-M or MA-S entries found for this org [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry. NOTE: IEEE's public OUI data publishes NO assignment/registration date; any "date registered" on third-party tools is a database artifact, not an IEEE fact.

HQ / country

No.15 Xinghua Avenue, Xiqing Economic Development Area, Tianjin 300385, CN [Confirmed] — IEEE MA-L; corroborated by hwaddress.com, semimedia.cc

Parent company

Wholly-owned subsidiary of NXP Semiconductors N.V. (Eindhoven, Netherlands); inherited via NXP's Dec-2015 acquisition of Freescale Semiconductor (the Tianjin site was a Freescale foreign-invested enterprise) [Confirmed] — semimedia.cc, fintel.io (NXP SEC subsidiary exhibit)

Company status

active [Confirmed] — nxp.com

Facility role

IC packaging, final test, and design; final test site for i.MX6ULZ applications processor; ~30 years operating in Tianjin; co-located design JV NXP Qiangxin (Tianjin) IC Design Co. Ltd. (51% NXP) for MCU/MPU and SoC design [Confirmed] — semimedia.cc, metal.com, invest.teda.gov.cn

Device types

embedded MCUs/MPUs (i.MX, i.MX RT, Kinetis/MCX), automotive electronics SoCs, AIoT chips, wireless connectivity (BLE / 802.15.4); networking-capable lines include Ethernet-bearing i.MX application processors and QorIQ/Layerscape network processors

[Confirmed] — nxp.com PCN 202011005I, linuxgizmos.com, metal.com

Verified sample prefixes (all MA-L, NXP Semiconductor (Tianjin) LTD.)

48:77:06, B4:3D:6B, C4:7D:A8, 20:8B:D1, D4:19:F6 [Confirmed] — IEEE MA-L / maclookup.app, hwaddress.com

Earliest third-party "date" artifact

D4:19:F6 labelled 2021-08-31 in maclookup.app's scraped IEEE copy [Likely — third-party scrape, NOT an IEEE fact] — maclookup.app

Security context

no Tianjin-specific incidents documented; parent NXP has documented CVEs in i.MX High Assurance Boot (HAB) secure boot and BLE wireless MCUs; the 23-block volume reflects factory MAC burning, not a security signal [Confirmed] — quarkslab.com, cvedetails.com, nxp.com

Vendor website

https://www.nxp.com/ (parent; no separate Tianjin subsidiary site) [Confirmed] — nxp.com

Analyst note

An NXP-Tianjin OUI on a globally-administered address identifies a genuine NXP-Tianjin-assembled chip's interface, but many such chips are embedded modules whose end-product vendor differs — OUI identifies the silicon's MAC assignee, not the finished-device brand.