AUMOVIO Czech Republic s.r.o. — 2 prefixes (MA-L)

A MAC address beginning 9C:28:BF or AC:C3:58 belongs to AUMOVIO Czech Republic s.r.o., the Czech manufacturing arm of the former Continental Automotive division, and most plausibly identifies automotive-electronics hardware built at its Brandýs nad Labem plant rather than consumer or general enterprise IT equipment.

The company was formerly Continental Automotive Czech Republic s.r.o. (IČO 62024922, founded 1994). Its parent, Continental AG, spun off its Automotive division as Aumovio SE, which began trading on the Frankfurt Stock Exchange on 2025-09-18 — the same lineage already verified on the sibling vendor-aumovio-germany entry.

This is not a bare single-OUI registration. Both prefixes are assigned to the identical Průmyslová 1851, Brandýs nad Labem address, and the underlying entity is a long-established, publicly registered s.r.o. with a documented multi-plant footprint across Adršpach, Brandýs nad Labem, Frenštát pod Radhoštěm, Jičín, Otrokovice, and Trutnov, plus a development center in Ostrava, reportedly employing 13,000+ people in the Czech Republic.

The Brandýs nad Labem plant is documented as producing electrical and electronic products for the automotive industry, consistent with the wider AUMOVIO group's ECU, sensor, and control-unit lines, though no per-prefix datasheet confirms the exact device class behind these two blocks specifically. The sister Jičín plant — same legal entity, a different address not tied to either OUI — instead makes brake boosters, electric vacuum pumps, brake hoses, and ABS/ABR components; it is cited only for company-wide context.

AUMOVIO is a large corporate group with many legally distinct country entities, each holding its own OUI blocks — Germany, the US-based AUMOVIO Systems, Inc., two Romanian entities, France, Aftermarket, Hungary, and Autonomous Mobility Germany among them. Prefixes should not be merged across these separate registrants.

IEEE assignment

2 prefixes (9C:28:BF, AC:C3:58) → AUMOVIO Czech Republic s.r.o., registered Průmyslová 1851, Brandýs nad Labem, CZ [Confirmed] — the IEEE MA-L registry 9C28BF, ACC358

Registry / block size

MA-L (24-bit OUI); 2 IEEE MA-L prefixes, both at the identical registered address. IEEE's public OUI data publishes NO assignment/registration date; maclookup.app's per-prefix "date registered" values are third-party database artifacts, not IEEE facts.

[Confirmed] — the IEEE MA-L registry, https://maclookup.app/macaddress/9c28bf, https://maclookup.app/macaddress/acc358

Registered address

Průmyslová 1851, Brandýs nad Labem, CZ 250 01 [Confirmed] — the IEEE MA-L registry

Company status

active; formerly Continental Automotive Czech Republic s.r.o. (IČO 62024922, founded 1994), now part of AUMOVIO SE following Continental AG's automotive spin-off (first traded Frankfurt Stock Exchange 2025-09-18)

[Confirmed] — https://www.finmag.cz/obchodni-rejstrik/62024922-aumovio-czech-republic-s-r-o, https://en.wikipedia.org/wiki/Aumovio_SE

Device types

Brandýs nad Labem plant (site of both OUIs) makes electrical/electronic automotive products [Confirmed — plant function]; exact device class behind these two prefixes specifically is inferred by analogy to the wider AUMOVIO ECU/sensor/control-unit lines

[Likely] — https://www.continental.com/cs-cz/kariera/lokality/brandys-nad-labem/

Company footprint

multi-plant presence (Adršpach, Brandýs nad Labem, Frenštát pod Radhoštěm, Jičín, Otrokovice, Trutnov) plus an Ostrava development center, reportedly 13,000+ employees in the Czech Republic [Confirmed] — https://www.continental.com/cs-cz/kariera/lokality/brandys-nad-labem/, https://www.continental.com/cs-cz/kariera/lokality/jicin/, https://gb.kompass.com/c/continental-automotive-czech-republic-s-r-o/cz030070/

Verified sample prefixes (both MA-L, AUMOVIO Czech Republic s.r.o.)

9C:28:BF, AC:C3:58 [Confirmed] — the IEEE MA-L registry

No MA-M / MA-S rows

no MA-M or MA-S registrations found for this Czech entity in the IEEE MA-M registry or the IEEE MA-S registry, unlike sibling AUMOVIO country units (Malaysia, Brazil, France) which do carry MA-M rows [Confirmed] — the IEEE MA-M registry, the IEEE MA-S registry

Security posture

no CVE specifically attributed to AUMOVIO Czech Republic s.r.o. or its former name found as of an August 2026 search; AUMOVIO group runs a public PSIRT and Auto-ISAC membership (group-wide, not Czech-entity-specific) [Confirmed — dated absence; Confirmed — PSIRT exists] — https://www.aumovio.com/en/company/corporate-governance/product-vulnerability-disclosure-program.html

Related vendors

distinct sibling AUMOVIO entities each hold separate OUI blocks — AUMOVIO Germany GmbH, AUMOVIO Systems, Inc. (US), AUMOVIO Systems Romania S.R.L., AUMOVIO Technologies Romania S.R.L., AUMOVIO France S.A.S., AUMOVIO Aftermarket GmbH, AUMOVIO Hungary Kft., AUMOVIO Autonomous Mobility Germany GmbH — do not merge prefixes across entities

[Confirmed] — the IEEE MA-L registry

Analyst note

a MAC beginning 9C:28:BF or AC:C3:58 most plausibly indicates automotive-electronics hardware manufactured at AUMOVIO Czech Republic's Brandýs nad Labem plant, not consumer or general enterprise IT equipment [Likely]