Xi'an LINKSCI Technology Co., Ltd. — D0:F1:21 (MA-L)

OUI D0:F1:21 belongs to Xi'an LINKSCI Technology Co., Ltd., a Chinese automotive electronics OEM supplier based in the ZTE Industrial Park on Tangyan South Road in the Xi'an Hi-tech Development Zone, Shaanxi Province. The block is a single MA-L assignment (a 24-bit OUI spanning roughly 16.7 million addresses), the only Linksci match across IEEE's MA-L, MA-M, and MA-S registries. Despite the "networking" connotation of an OUI, Linksci does not ship consumer networking gear: its hardware is vehicle-embedded wireless modules. FCC filings under grantee code 2BKRN document an Ultra-Wideband (UWB) digital-key antenna (LD220UKA, operating 6.0–8.5 GHz plus 2.4 GHz BLE) used in Polestar vehicles, a digital-key authentication module (LD220-DKAM-1), a key-fob assembly (LD220-KEYFOB-1), and a telematics control/access module (LT821-1, "TCAM4," at 2.4 GHz). The telematics filing is registered to a separate Wuhan (Hubei) address, which suggests the company operates or has relocated some operations across two sites. No standalone public vendor website (linksci.com / linksci.cn) was found; the company's footprint is corroborated through the FCC Registration Authority and a Polestar owner's manual referencing the LD220 UWB system. No CVEs or product-specific security advisories were found for Linksci devices in NVD or CISA KEV; the broader automotive UWB/BLE digital-key class has documented relay- and spoofing-attack research industry-wide, but none of it is Linksci-specific. As with all OUI data, note that IEEE publishes no registration date for MA-L blocks — the 2021-07-07 "date" carried by third-party MAC lookup tools is a database artifact, not an IEEE fact.

IEEE assignment

D0:F1:21 → Xi'an LINKSCI Technology Co., Ltd. [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv line 837); single match, none in mam.csv/oui36.csv

Registry / block size

MA-L (24-bit OUI; ~16.7M addresses) [Confirmed] — IEEE MA-L, maclookup.app

Registered address

C301 (Room A301), main building, ZTE Industrial Park, No.10 Tangyan South Road, Hi-tech Zone, Xi'an, Shaanxi, CN 710076 [Confirmed] — IEEE MA-L; https://fccid.io/2BKRNLD220UKA (registry vs. FCC give "C301" vs. "A301" — minor source discrepancy)

Country

CN [Confirmed] — IEEE MA-L

Allocated date

Unknown — IEEE publishes NO assignment/registration date for OUI/MA-L blocks; oui.csv carries only Registry, Assignment, Organization Name, Organization Address. The 2021-07-07 "date" on maclookup.app is a third-party database artifact, NOT an IEEE fact and must not be presented as one. [Confirmed that no IEEE date exists] — https://maclookup.app/vendors/xi-an-linksci-technology-co-ltd

Company status / industry

active automotive electronics OEM supplier (vehicle-embedded wireless modules), not a consumer networking vendor [Likely] — FCC grantee 2BKRN filings (4 filings 2024–2025); https://fccid.io/2BKRN

Related entity

Hubei Linksci Technology Co., Ltd. (Wuhan address) registered the TCAM4 (LT821-1) telematics filing — possible relocation or split operations between Xi'an and Wuhan [Likely] — https://fccid.io/2BKRNLT821-1

Device types

automotive UWB digital-key antenna (LD220UKA, 6.0–8.5 GHz + 2.4 GHz BLE; in Polestar vehicles), digital-key authentication module (LD220-DKAM-1), key fob (LD220-KEYFOB-1), telematics control/access module (LT821-1 / TCAM4, 2.4 GHz) — all OEM, not retail [Confirmed] — https://fccid.io/2BKRNLD220UKA, https://fccid.io/2BKRNLD220-DKAM-1, https://fccid.io/2BKRNLT821-1

Website

Unknown — no standalone public vendor site (linksci.com / linksci.cn) found [Confirmed search yielded none] — https://fccid.io/2BKRN

Security note

No Linksci-specific CVEs or advisories found in NVD/CISA KEV. The product class (automotive UWB digital key + telematics) faces documented industry-wide UWB relay and BLE digital-key spoofing research, but none is Linksci-specific; FCC RF-exposure separation requirements are compliance, not a security finding. [Confirmed absence of Linksci-specific findings] — https://nvd.nist.gov/vuln, https://vicone.com/blog/from-fob-to-phone-how-ccc-digital-key-40-shapes-automotive-cybersecurity/

Analyst note

A D0:F1:21 globally-administered address identifies genuine Linksci-built automotive modules — most likely embedded in vehicles (e.g. Polestar) rather than standalone network endpoints. Seeing this OUI on a network typically means a vehicle's digital-key/telematics subsystem, not consumer networking hardware.