Robert Bosch Elektronika Kft. — MA-L (08:4B:44, 48:31:33) + related blocks

Robert Bosch Elektronika Kft. is a wholly-owned Hungarian subsidiary of the Bosch Group (Robert Bosch GmbH, Stuttgart) operating the company's automotive-electronics plant at Robert Bosch út 1, 3000 Hatvan, Heves County, Hungary. Founded in 1998, the Hatvan site is the Bosch Group's single largest automotive-electronics manufacturing center and employs roughly 5,000 people. The IEEE registry carries two MA-L blocks under the exact spelling "Robert Bosch Elektronika Kft." — 48:31:33 and 08:4B:44 — plus a third MA-L block 10:BD:43 and an MA-M block D4:61:37:2 under the Hungarian adjectival spelling "Robert Bosch Elektronikai Kft.", all sharing the same Hatvan address and therefore the same legal entity. The Hatvan facility builds automotive electronics rather than consumer IT gear: inverters, converters and EV charging units; ADAS control electronics, radar sensors and camera systems; and electric steering-control modules. Devices carrying these prefixes are best understood as embedded automotive ECUs, ADAS modules, or EV-powertrain electronics destined for vehicle integration, so encountering one on a general IT network would be unusual and most likely points to a telematics or onboard-diagnostics unit. This entry is distinct from Robert Bosch GmbH and other Bosch subsidiaries (e.g. Bosch Security Systems, Robert Bosch Car Multimedia) that hold their own separate OUI blocks. As with every OUI record, no registration date is published — IEEE does not publish assignment dates, and the "date registered" figures on third-party MAC databases are scraping artifacts, not first-party facts.

IEEE assignment

MA-L (24-bit OUI) blocks 48:31:33 and 08:4B:44 → "Robert Bosch Elektronika Kft."; MA-L 10:BD:43 and MA-M (28-bit) D4:61:37:2 → "Robert Bosch Elektronikai Kft." (same Hatvan entity, Hungarian adjectival spelling)

[Confirmed] — IEEE MA-L / MA-M (the IEEE MA-L registry lines 154, 30913, 31183; the IEEE MA-M registry line 3958)

Registry / block size

MA-L (OUI-24, ~16.8M addresses each) for the three /24 prefixes; MA-M (28-bit, ~1.05M addresses) for D4:61:37:2 [Confirmed] — IEEE registry CSV

Org name in registry

"Robert Bosch Elektronika Kft." (483133, 084B44) and the closely-related "Robert Bosch Elektronikai Kft." (10BD43, D461372) — Hungarian noun vs adjectival form of the same entity, identical address [Confirmed] — IEEE MA-L / MA-M

HQ / country

Robert Bosch út 1., 3000 Hatvan, Heves County, Hungary (HU) [Confirmed] — IEEE registry; corroborated by bosch.hu and EMIS company profile

Allocated/registration date

Unknown — IEEE publishes NO assignment/registration date for OUI/MAC blocks; the registry CSV has no date column. Third-party "date registered" values (e.g. maclookup.app showing 2025-02-04 for 084B44 and 2023-03-17 for 483133) are database artifacts, not IEEE facts, and must NOT be recorded as a registration date.

[Confirmed — abstention is correct] — IEEE registry schema

Parent company

Bosch Group / Robert Bosch GmbH, Stuttgart, Germany; the Hatvan plant is the group's largest automotive-electronics manufacturing site [Confirmed] — bosch.hu, boschmediaservice.hu

Established

1998 (Hatvan facility founded) [Confirmed] — boschmediaservice.hu, bosch.hu

Device types

automotive electronics — EV inverters/converters/charging units, ADAS control electronics, radar sensors, camera systems, electric steering-control modules; OUI blocks most likely back embedded automotive ECUs/ADAS/EV electronics, not consumer/enterprise networking gear

[Likely] — bosch.hu, boschmediaservice.hu

Related prefixes attributed in some databases

44:0C:EE and D4:61:37 (MA-M partial) — surfaced by third-party aggregators; 44:0C:EE not confirmed in the cached IEEE registry [Likely] — maclookup.app, macvendorlookup.com, netify.ai

Security context

automotive OEM ECU/sensor supplier; a MAC with these prefixes on a non-automotive network would be unusual (likely vehicle telematics/V2X or an OBD dongle). No CVEs or public advisories specific to these OUI blocks were found; general Bosch automotive cybersecurity posture follows ISO/SAE 21434

[Likely] — bosch.hu, boschmediaservice.hu

Vendor site

https://www.bosch.hu/vallalatunk/a-bosch-magyarorszagon/hatvan/ (Bosch Hungary Hatvan page); parent group https://www.bosch.com/ [Confirmed] — bosch.hu

Analyst note

entity also appears as "Robert Bosch Elektronika Gyártó Kft." in Hungarian trade directories — same legal entity; ~5,047 employees (2026, EMIS). No IANA RFC reference applies (OUI entry, not a protocol or ASN); no RIR/ASN registration date applies here.