STMicroelectronics' MAC footprint surfaces under "STMicroelectronics SRL" (the main registrant entity), holding about 2 blocks — an MA-L and a legacy IAB. Verified samples include 00:80:E1 (MA-L) and 00:50:C2:25:5 (IAB). A data-quality oddity worth flagging: the IEEE record shows "1000 Aztec West, London, GB," but Aztec West is actually a business park in Bristol, UK, not London, and ST's corporate HQ is in Geneva, Switzerland — this reflects what the underlying IEEE record shows and is preserved as-is rather than "corrected." These OUIs appear on STM32 microcontrollers, IoT/embedded silicon, sensors, and connectivity parts — ST silicon carries the burned-in MAC on IoT and embedded devices. Like other large semiconductor makers, ST likely holds additional blocks under name variants not enumerated under the exact SRL page. The key analyst point is the chipset pattern: an ST OUI may identify a device built on ST silicon regardless of brand. For triage, an ST OUI typically flags ST silicon inside an embedded or IoT device regardless of brand.
- IEEE assignment
- "STMicroelectronics SRL" (main entity), ~2 blocks (MA-L + legacy IAB) [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L + a legacy IAB; ~2 blocks under the SRL entity [Confirmed] — maclookup.app (IEEE-sourced)
- HQ / country
- IEEE record shows "1000 Aztec West, London, GB" (Aztec West is actually in Bristol, UK — a data-quality oddity); ST corporate HQ Geneva, Switzerland [Confirmed record; oddity flagged] — maclookup.app
- Company status
- active [Confirmed] — st.com
- Device types
- STM32 MCUs, IoT/embedded silicon, sensors, connectivity with burned-in MACs [Confirmed] — maclookup.app
- Notable products
- STM32 microcontrollers; MEMS sensors; embedded/IoT silicon
- Verified prefix sample
- 00:80:E1 (MA-L), 00:50:C2:25:5 (IAB) [Confirmed] — maclookup.app
- Special note
- An ST OUI may identify a device built on ST silicon regardless of brand — a chipset-OUI flag. The SRL registered address contains a known IEEE data-entry irregularity ("1000 Aztec West, London, GB"); preserved as-is. ST likely holds additional blocks under name variants not enumerated here. The IEEE registry publishes no assignment dates, so none is stated here. [Confirmed]
- Related vendors
- none significant (silicon supplier to many brands)
- Analyst note
- An ST OUI typically flags ST silicon inside an embedded/IoT device regardless of brand.