Which company owns MAC address prefix B0:1C:91?

MAC address prefix B0:1C:91 is registered to Elim Co in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:1C:91 has a network interface built by Elim Co.

What is the OUI B0:1C:91?

B0:1C:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Elim Co. It covers every address from B0:1C:91:00:00:00 to B0:1C:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-1C-91.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:1C:91:00:00:00 that is B0:1C:91 — 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 Elim Co located?

Elim Co is listed at 4F Gagu Plaza B/D 81-9, jeongja-dong, Jangan-gu, Suwon city Gyeonggi-Do KR 440-300 in the IEEE OUI registry entry for B0:1C:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Elim Co

MAC address prefix B0:1C:91 is registered to Elim Co in the IEEE OUI registry. Any device whose MAC address begins with B0:1C:91 has a network interface built by Elim Co. 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 B0:1C:91:00:00:00 to B0:1C:91:FF:FF:FF.

OUI prefix: B0:1C:91
Hyphen form: B0-1C-91
MAC range: B0:1C:91:00:00:00 – B0:1C:91:FF:FF:FF
Addresses in block: 16,777,216
Organization: Elim Co
Address: 4F Gagu Plaza B/D 81-9, jeongja-dong, Jangan-gu, Suwon city Gyeonggi-Do KR 440-300
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.

2016-07-29Assigned to "Elim Co"
archived source →
2026-07-17Assigned to "Elim Co"

Nearby in the registry

The prefixes assigned immediately before and after B0:1C:91:

FAQ

Which company owns MAC address prefix B0:1C:91?: MAC address prefix B0:1C:91 is registered to Elim Co in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:1C:91 has a network interface built by Elim Co.
What is the OUI B0:1C:91?: B0:1C:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Elim Co. It covers every address from B0:1C:91:00:00:00 to B0:1C:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-1C-91.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:1C:91:00:00:00 that is B0:1C:91 — 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 Elim Co located?: Elim Co is listed at 4F Gagu Plaza B/D 81-9, jeongja-dong, Jangan-gu, Suwon city Gyeonggi-Do KR 440-300 in the IEEE OUI registry entry for B0:1C:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.