STMicrolectronics International NV — 4 prefixes (MA-L); ST corporate-family name variant, chipset OUI

The cached IEEE MA-L registry carries a distinct registrant string, "STMicrolectronics International NV," holding 4 MA-L blocks: 50:0F:59, 10:E7:7A, 18:E8:EC, and 80:82:F5, all sharing one Geneva address (39, Chemin du Champ-des-Filles, Plan-les-Ouates, CH 1228). Two registry-string oddities are preserved verbatim rather than silently corrected: the org name is missing the "e" in "Microelectronics," and the city segment renders as "Plan-les-Quates" (a likely IEEE typo for Plan-les-Ouates, a real Geneva commune). This is a separate registry row from the correctly-spelled "STMicroelectronics SRL" entity (already finalized, holder of 00:80:E1 plus a legacy IAB) — treat it as a name variant of the same corporate group, not a confirmed identical legal entity, since the registry itself lists them as separate organization-name rows. STMicroelectronics is a large, publicly traded European semiconductor maker (STM32 microcontrollers, MEMS sensors, power and automotive ICs), so these blocks appear on ST silicon inside embedded and IoT devices. The analyst point mirrors the SRL entry: an ST OUI flags a device built on ST silicon regardless of the finished-goods brand.

IEEE assignment

"STMicrolectronics International NV" (registry string, missing 'e' in "Microelectronics"), 4 MA-L blocks [Confirmed] — IEEE MA-L (cached copy)

Registry / block size

MA-L only; 4 blocks under this exact org string. No matches in the IEEE MA-M registry (MA-M) or the IEEE MA-S registry (MA-S) for this name [Confirmed] — IEEE the IEEE MA-L registry / the IEEE MA-M registry / the IEEE MA-S registry

Prefixes

50:0F:59, 10:E7:7A, 18:E8:EC, 80:82:F5 (all MA-L, identical org string + address) [Confirmed] — IEEE MA-L

HQ / country

39, Chemin du Champ-des-Filles, Plan-les-Ouates, Geneva, CH 1228 (registry renders city as "Plan-les-Quates" — likely IEEE typo for Plan-les-Ouates; preserved as-is); country CH (Switzerland), consistent with ST's real Geneva HQ [Confirmed record; typo flagged] — IEEE MA-L

Company status

active [Confirmed] — st.com

Device types

STM32 MCUs, IoT/embedded silicon, MEMS sensors, connectivity parts with burned-in MACs [Confirmed] — st.com, en.wikipedia.org/wiki/STMicroelectronics

Notable products

STM32 microcontrollers; MEMS sensors; embedded/IoT and automotive silicon [Confirmed] — st.com

Relationship to STMicroelectronics SRL

likely the same corporate family (shared "STMicroelectronics" brand + Geneva address), but a distinct registrant string holding its own separate 4 MA-L blocks; registry lists them as separate org-name rows [Likely] — IEEE MA-L (both rows), maclookup.app/vendors/stmicroelectronics-srl

Assignment dates

none — IEEE publishes no assignment/registration dates for OUI records; any third-party "date registered" is a database artifact, not an IEEE fact [Confirmed] — IEEE the IEEE MA-L registry (no date column)

Special note

An ST OUI may identify a device built on ST silicon regardless of brand — a chipset-OUI flag. Registry string irregularities ("STMicrolectronics", "Plan-les-Quates") preserved as-is. A related but separately-registered "STMicroelectronics SRL" row holds different blocks. [Confirmed]

Related vendors

STMicroelectronics SRL (same corporate group, separate registrant string, different blocks)

Analyst note

An ST OUI typically flags ST silicon inside an embedded/IoT device regardless of finished-goods brand.