Which company owns MAC address prefix BC:FF:AC?

MAC address prefix BC:FF:AC is registered to TOPCON CORPORATION in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:FF:AC has a network interface built by TOPCON CORPORATION.

What is the OUI BC:FF:AC?

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

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in BC:FF:AC:00:00:00 that is BC:FF:AC — 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 TOPCON CORPORATION located?

TOPCON CORPORATION is listed at 75-1, Hasunuma-cho Itabashi-ku TOKYO JP 174-8580 in the IEEE OUI registry entry for BC:FF:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TOPCON CORPORATION

MAC address prefix BC:FF:AC is registered to TOPCON CORPORATION in the IEEE OUI registry. Any device whose MAC address begins with BC:FF:AC has a network interface built by TOPCON CORPORATION. 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:FF:AC:00:00:00 to BC:FF:AC:FF:FF:FF.

OUI prefix: BC:FF:AC
Hyphen form: BC-FF-AC
MAC range: BC:FF:AC:00:00:00 – BC:FF:AC:FF:FF:FF
Addresses in block: 16,777,216
Organization: TOPCON CORPORATION
Address: 75-1, Hasunuma-cho Itabashi-ku TOKYO JP 174-8580
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 "TOPCON CORPORATION"
archived source →
2026-07-17Assigned to "TOPCON CORPORATION"

Nearby in the registry

The prefixes assigned immediately before and after BC:FF:AC:

FAQ

Which company owns MAC address prefix BC:FF:AC?: MAC address prefix BC:FF:AC is registered to TOPCON CORPORATION in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:FF:AC has a network interface built by TOPCON CORPORATION.
What is the OUI BC:FF:AC?: BC:FF:AC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TOPCON CORPORATION. It covers every address from BC:FF:AC:00:00:00 to BC:FF:AC:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-FF-AC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in BC:FF:AC:00:00:00 that is BC:FF:AC — 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 TOPCON CORPORATION located?: TOPCON CORPORATION is listed at 75-1, Hasunuma-cho Itabashi-ku TOKYO JP 174-8580 in the IEEE OUI registry entry for BC:FF:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.