Which company owns MAC address prefix FC:33:57?

MAC address prefix FC:33:57 is registered to KAGA FEI Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:33:57 has a network interface built by KAGA FEI Co., Ltd..

What is the OUI FC:33:57?

FC:33:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to KAGA FEI Co., Ltd.. It covers every address from FC:33:57:00:00:00 to FC:33:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-33-57.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in FC:33:57:00:00:00 that is FC:33:57 — 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 KAGA FEI Co., Ltd. located?

KAGA FEI Co., Ltd. is listed at 100-45, Shinyokohama 2-Chome Kohoku-Ku Yokohama-Shi Kanagawa JP 222-8508 in the IEEE OUI registry entry for FC:33:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.

KAGA FEI Co., Ltd.

MAC address prefix FC:33:57 is registered to KAGA FEI Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with FC:33:57 has a network interface built by KAGA FEI 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 FC:33:57:00:00:00 to FC:33:57:FF:FF:FF.

OUI prefix: FC:33:57
Hyphen form: FC-33-57
MAC range: FC:33:57:00:00:00 – FC:33:57:FF:FF:FF
Addresses in block: 16,777,216
Organization: KAGA FEI Co., Ltd.
Address: 100-45, Shinyokohama 2-Chome Kohoku-Ku Yokohama-Shi Kanagawa JP 222-8508
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 (1)

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

2026-07-17Assigned to "KAGA FEI Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after FC:33:57:

FAQ

Which company owns MAC address prefix FC:33:57?: MAC address prefix FC:33:57 is registered to KAGA FEI Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:33:57 has a network interface built by KAGA FEI Co., Ltd..
What is the OUI FC:33:57?: FC:33:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to KAGA FEI Co., Ltd.. It covers every address from FC:33:57:00:00:00 to FC:33:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-33-57.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in FC:33:57:00:00:00 that is FC:33:57 — 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 KAGA FEI Co., Ltd. located?: KAGA FEI Co., Ltd. is listed at 100-45, Shinyokohama 2-Chome Kohoku-Ku Yokohama-Shi Kanagawa JP 222-8508 in the IEEE OUI registry entry for FC:33:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.