Renesas Electronics' MAC footprint spans IEEE registrants that should be aliased to one family: "Renesas Electronics (Penang) Sdn. Bhd." (26 prefixes; MA-L) plus the legacy "Dialog Semiconductor" (1 prefix; D4:3D:39) and "Dialog Semiconductor Hellas SA." Renesas' group HQ is in Tokyo, Japan, with the main registrant entity above in Penang, Malaysia, and Dialog Hellas in Athens, Greece. These OUIs appear on microcontrollers, connectivity/Wi-Fi/BT silicon (via Dialog), embedded/IoT silicon, and automotive parts — Renesas and Dialog silicon carry the burned-in MAC on embedded and IoT devices. Renesas' heritage includes the NEC, Hitachi, and Mitsubishi MCU lineages, and it acquired Dialog Semiconductor in 2021 (completed 31 August 2021) and Celeno (Wi-Fi) in 2021 (completed 20 December 2021); "Dialog Semiconductor" persists as a distinct legacy registrant. The key analyst point is the chipset pattern: a Renesas/Dialog OUI may identify a device built on their silicon regardless of brand. For triage, a Renesas/Dialog OUI flags their MCU or connectivity silicon in embedded or IoT devices regardless of brand.
- IEEE assignment
- multiple entities — "Renesas Electronics (Penang) Sdn. Bhd." (26; MA-L), legacy "Dialog Semiconductor" (1; D4:3D:39), "Dialog Semiconductor Hellas SA" [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L; Renesas Penang ~26 blocks, Dialog ~1 [Confirmed] — maclookup.app (IEEE-derived). NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" from third-party tools is a database artifact, not an IEEE fact.
- HQ / country
- Renesas group HQ Tokyo, Japan; registrant entity in Penang, Malaysia; Dialog Semiconductor (D4:3D:39) registered in Seongnam-si, Gyeonggi-do, KR; Dialog Hellas in Athens, Greece [Confirmed] — maclookup.app
- Company status
- active; acquired Dialog Semiconductor (completed 2021-08-31) and Celeno (Wi-Fi, completed 2021-12-20) [Confirmed] — renesas.com
- Device types
- microcontrollers, connectivity/Wi-Fi/BT silicon (via Dialog), embedded/IoT silicon, automotive with burned-in MACs [Confirmed] — maclookup.app
- Notable products
- RA/RX/RL78 MCUs; Dialog connectivity/BT silicon; automotive SoCs
- Verified prefix sample
- D4:3D:39 (Dialog Semiconductor) [Confirmed] — maclookup.app
- Special note
- Renesas heritage includes NEC + Hitachi + Mitsubishi MCU lineages; "Dialog Semiconductor" persists as a distinct legacy registrant. A Renesas/Dialog OUI may identify a device built on their silicon regardless of brand. [Confirmed]
- Related vendors
- Dialog Semiconductor (acquired 2021, completed 2021-08-31); Celeno (Wi-Fi, acquired 2021, completed 2021-12-20)
- Analyst note
- A Renesas/Dialog OUI flags their MCU/connectivity silicon in embedded/IoT devices regardless of brand.