Which company owns MAC address prefix BC:2B:1E?

MAC address prefix BC:2B:1E is registered to Cresyn Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:2B:1E has a network interface built by Cresyn Co., Ltd..

What is the OUI BC:2B:1E?

BC:2B:1E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cresyn Co., Ltd.. It covers every address from BC:2B:1E:00:00:00 to BC:2B:1E:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-2B-1E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in BC:2B:1E:00:00:00 that is BC:2B:1E — 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 Cresyn Co., Ltd. located?

Cresyn Co., Ltd. is listed at CRESYN B/D, Gangnam-daero 107-gil, Seocho-gu, Seoul Seoul CRESYN B/D, Gangnam-daero 107-gil KR 06254 in the IEEE OUI registry entry for BC:2B:1E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cresyn Co., Ltd.

MAC address prefix BC:2B:1E is registered to Cresyn Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with BC:2B:1E has a network interface built by Cresyn Co., Ltd.. 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 BC:2B:1E:00:00:00 to BC:2B:1E:FF:FF:FF.

OUI prefix: BC:2B:1E
Hyphen form: BC-2B-1E
MAC range: BC:2B:1E:00:00:00 – BC:2B:1E:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cresyn Co., Ltd.
Address: CRESYN B/D, Gangnam-daero 107-gil, Seocho-gu, Seoul Seoul CRESYN B/D, Gangnam-daero 107-gil KR 06254
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.

2026-01-08Assigned to "Cresyn Co., Ltd."
archived source →
2026-07-17Assigned to "Cresyn Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after BC:2B:1E:

FAQ

Which company owns MAC address prefix BC:2B:1E?: MAC address prefix BC:2B:1E is registered to Cresyn Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:2B:1E has a network interface built by Cresyn Co., Ltd..
What is the OUI BC:2B:1E?: BC:2B:1E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cresyn Co., Ltd.. It covers every address from BC:2B:1E:00:00:00 to BC:2B:1E:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-2B-1E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in BC:2B:1E:00:00:00 that is BC:2B:1E — 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 Cresyn Co., Ltd. located?: Cresyn Co., Ltd. is listed at CRESYN B/D, Gangnam-daero 107-gil, Seocho-gu, Seoul Seoul CRESYN B/D, Gangnam-daero 107-gil KR 06254 in the IEEE OUI registry entry for BC:2B:1E. This is the address the organization registered with the IEEE, which may differ from its current operating address.