Which company owns MAC address prefix 9C:28:BF?

MAC address prefix 9C:28:BF is registered to AUMOVIO Czech Republic s.r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:28:BF has a network interface built by AUMOVIO Czech Republic s.r.o..

What is the OUI 9C:28:BF?

9C:28:BF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AUMOVIO Czech Republic s.r.o.. It covers every address from 9C:28:BF:00:00:00 to 9C:28:BF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-28-BF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:28:BF:00:00:00 that is 9C:28:BF — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is AUMOVIO Czech Republic s.r.o. located?

AUMOVIO Czech Republic s.r.o. is listed at Průmyslová 1851 Brandýs nad Labem CZ 250 01 in the IEEE OUI registry entry for 9C:28:BF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does AUMOVIO Czech Republic s.r.o. own?

AUMOVIO Czech Republic s.r.o. holds 2 OUI prefixes in the IEEE registry, of which 9C:28:BF is one. A device made by AUMOVIO Czech Republic s.r.o. could carry a MAC address from any of them.

AUMOVIO Czech Republic s.r.o.

MAC address prefix 9C:28:BF is registered to AUMOVIO Czech Republic s.r.o. in the IEEE OUI registry. Any device whose MAC address begins with 9C:28:BF has a network interface built by AUMOVIO Czech Republic s.r.o.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from 9C:28:BF:00:00:00 to 9C:28:BF:FF:FF:FF.

OUI prefix: 9C:28:BF
Hyphen form: 9C-28-BF
MAC range: 9C:28:BF:00:00:00 – 9C:28:BF:FF:FF:FF
Addresses in block: 16,777,216
Organization: AUMOVIO Czech Republic s.r.o.
Address: Průmyslová 1851 Brandýs nad Labem CZ 250 01
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Other prefixes from AUMOVIO Czech Republic s.r.o.

AUMOVIO Czech Republic s.r.o. holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

AC:C3:58

Assignment history (3)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2016-07-29Assigned to "Continental Automotive Czech Republic s.r.o."
archived source →
2026-01-08Renamed from "Continental Automotive Czech Republic s.r.o." to "AUMOVIO Czech Republic s.r.o."
archived source →
2026-07-17Assigned to "AUMOVIO Czech Republic s.r.o."

Nearby in the registry

The prefixes assigned immediately before and after 9C:28:BF:

FAQ

Which company owns MAC address prefix 9C:28:BF?: MAC address prefix 9C:28:BF is registered to AUMOVIO Czech Republic s.r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:28:BF has a network interface built by AUMOVIO Czech Republic s.r.o..
What is the OUI 9C:28:BF?: 9C:28:BF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AUMOVIO Czech Republic s.r.o.. It covers every address from 9C:28:BF:00:00:00 to 9C:28:BF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-28-BF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:28:BF:00:00:00 that is 9C:28:BF — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is AUMOVIO Czech Republic s.r.o. located?: AUMOVIO Czech Republic s.r.o. is listed at Průmyslová 1851 Brandýs nad Labem CZ 250 01 in the IEEE OUI registry entry for 9C:28:BF. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does AUMOVIO Czech Republic s.r.o. own?: AUMOVIO Czech Republic s.r.o. holds 2 OUI prefixes in the IEEE registry, of which 9C:28:BF is one. A device made by AUMOVIO Czech Republic s.r.o. could carry a MAC address from any of them.