Silicon Laboratories holds about 142 MA-L blocks registered as "Silicon Laboratories" at 400 West Cesar Chavez, Austin, TX (older blocks list a W. William Cannon Dr. address) — a heavy registrant. Verified samples include 38:5C:FB, 28:DB:A7, and CC:CC:CC. These OUIs appear on Zigbee/Thread/Matter/BLE SoCs (the EFR32 Wireless Gecko family), IoT wireless modules, and microcontrollers. Silicon Labs acquired the Zigbee pioneer Ember, and its silicon is foundational in Zigbee smart-home devices — used widely across the Philips Hue ecosystem and other Zigbee products — with EFR32 ubiquitous in Zigbee/Thread/Matter. The key analyst point is the chipset pattern: a Silicon Labs OUI identifies a device built on Silicon Labs silicon regardless of brand. For triage, a Silicon Labs OUI typically indicates a Zigbee/Thread/Matter smart-home device built on Silabs silicon, with the brand determined elsewhere.
- IEEE assignment
- ~142 prefixes → "Silicon Laboratories", registered Austin, TX, US [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L; ~142 blocks [Confirmed] — maclookup.app (IEEE-sourced)
- HQ / country
- 400 West Cesar Chavez, Austin TX 78701, US (older blocks: 7000 W. William Cannon Dr., Austin TX 78735) [Confirmed] — maclookup.app
- Company status
- active; acquired Zigbee pioneer Ember [Confirmed] — silabs.com
- Device types
- Zigbee/Thread/Matter/BLE SoCs (EFR32 Wireless Gecko), IoT wireless modules, microcontrollers [Confirmed] — maclookup.app
- Notable products
- EFR32 Wireless Gecko SoCs; IoT wireless modules
- Verified prefix sample
- 38:5C:FB, 28:DB:A7, CC:CC:CC [Confirmed] — maclookup.app
- Special note
- A Silicon Labs OUI is a chipset-OUI flag — foundational in Zigbee smart-home devices (used widely across Hue-ecosystem and other Zigbee products); EFR32 is ubiquitous in Zigbee/Thread/Matter. Acquired Ember. The IEEE registry publishes no assignment dates, so none is stated here. [Confirmed]
- Related vendors
- Ember (acquired)
- Analyst note
- A Silicon Labs OUI typically indicates a Zigbee/Thread/Matter smart-home device built on Silabs silicon — brand determined elsewhere.