Which company owns MAC address prefix BC:4E:3C?

MAC address prefix BC:4E:3C is registered to CORE STAFF CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:4E:3C has a network interface built by CORE STAFF CO., LTD..

What is the OUI BC:4E:3C?

BC:4E:3C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CORE STAFF CO., LTD.. It covers every address from BC:4E:3C:00:00:00 to BC:4E:3C:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-4E-3C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in BC:4E:3C:00:00:00 that is BC:4E:3C — 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 CORE STAFF CO., LTD. located?

CORE STAFF CO., LTD. is listed at Shin-osaka Oriental Bldg. 14F, 7-1-26 Nishinakajima Yodogawa-ku Osaka JP 532-0011 in the IEEE OUI registry entry for BC:4E:3C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

CORE STAFF CO., LTD.

MAC address prefix BC:4E:3C is registered to CORE STAFF CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with BC:4E:3C has a network interface built by CORE STAFF 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:4E:3C:00:00:00 to BC:4E:3C:FF:FF:FF.

OUI prefix: BC:4E:3C
Hyphen form: BC-4E-3C
MAC range: BC:4E:3C:00:00:00 – BC:4E:3C:FF:FF:FF
Addresses in block: 16,777,216
Organization: CORE STAFF CO., LTD.
Address: Shin-osaka Oriental Bldg. 14F, 7-1-26 Nishinakajima Yodogawa-ku Osaka JP 532-0011
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 "CORE STAFF CO., LTD."
archived source →
2026-07-17Assigned to "CORE STAFF CO., LTD."

Nearby in the registry

The prefixes assigned immediately before and after BC:4E:3C:

FAQ

Which company owns MAC address prefix BC:4E:3C?: MAC address prefix BC:4E:3C is registered to CORE STAFF CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:4E:3C has a network interface built by CORE STAFF CO., LTD..
What is the OUI BC:4E:3C?: BC:4E:3C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CORE STAFF CO., LTD.. It covers every address from BC:4E:3C:00:00:00 to BC:4E:3C:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-4E-3C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in BC:4E:3C:00:00:00 that is BC:4E:3C — 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 CORE STAFF CO., LTD. located?: CORE STAFF CO., LTD. is listed at Shin-osaka Oriental Bldg. 14F, 7-1-26 Nishinakajima Yodogawa-ku Osaka JP 532-0011 in the IEEE OUI registry entry for BC:4E:3C. This is the address the organization registered with the IEEE, which may differ from its current operating address.