Which company owns MAC address prefix 54:DB:A2?

MAC address prefix 54:DB:A2 is registered to Fibrain in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:DB:A2 has a network interface built by Fibrain.

What is the OUI 54:DB:A2?

54:DB:A2 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fibrain. It covers every address from 54:DB:A2:00:00:00 to 54:DB:A2:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-DB-A2.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 54:DB:A2:00:00:00 that is 54:DB:A2 — 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 Fibrain located?

Fibrain is listed at Zaczernie 190F Zaczernie Subcarpathia PL 36-062 in the IEEE OUI registry entry for 54:DB:A2. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Fibrain

MAC address prefix 54:DB:A2 is registered to Fibrain in the IEEE OUI registry. Any device whose MAC address begins with 54:DB:A2 has a network interface built by Fibrain. 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 54:DB:A2:00:00:00 to 54:DB:A2:FF:FF:FF.

OUI prefix: 54:DB:A2
Hyphen form: 54-DB-A2
MAC range: 54:DB:A2:00:00:00 – 54:DB:A2:FF:FF:FF
Addresses in block: 16,777,216
Organization: Fibrain
Address: Zaczernie 190F Zaczernie Subcarpathia PL 36-062
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.

Assignment history (2)

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

2020-11-28Assigned to "Fibrain"
archived source →
2026-07-17Assigned to "Fibrain"

Nearby in the registry

The prefixes assigned immediately before and after 54:DB:A2:

FAQ

Which company owns MAC address prefix 54:DB:A2?: MAC address prefix 54:DB:A2 is registered to Fibrain in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:DB:A2 has a network interface built by Fibrain.
What is the OUI 54:DB:A2?: 54:DB:A2 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fibrain. It covers every address from 54:DB:A2:00:00:00 to 54:DB:A2:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-DB-A2.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 54:DB:A2:00:00:00 that is 54:DB:A2 — 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 Fibrain located?: Fibrain is listed at Zaczernie 190F Zaczernie Subcarpathia PL 36-062 in the IEEE OUI registry entry for 54:DB:A2. This is the address the organization registered with the IEEE, which may differ from its current operating address.