Which company owns MAC address prefix 38:BF:33?

MAC address prefix 38:BF:33 is registered to NEC CASIO Mobile Communications in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:BF:33 has a network interface built by NEC CASIO Mobile Communications.

What is the OUI 38:BF:33?

38:BF:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NEC CASIO Mobile Communications. It covers every address from 38:BF:33:00:00:00 to 38:BF:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-BF-33.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 38:BF:33:00:00:00 that is 38:BF:33 — 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 NEC CASIO Mobile Communications located?

NEC CASIO Mobile Communications is listed at 1753,Shimonumabe Kawasaki-shi Kanagawa JP 211-8666 in the IEEE OUI registry entry for 38:BF:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does NEC CASIO Mobile Communications own?

NEC CASIO Mobile Communications holds 2 OUI prefixes in the IEEE registry, of which 38:BF:33 is one. A device made by NEC CASIO Mobile Communications could carry a MAC address from any of them.

NEC CASIO Mobile Communications

MAC address prefix 38:BF:33 is registered to NEC CASIO Mobile Communications in the IEEE OUI registry. Any device whose MAC address begins with 38:BF:33 has a network interface built by NEC CASIO Mobile Communications. 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 38:BF:33:00:00:00 to 38:BF:33:FF:FF:FF.

OUI prefix: 38:BF:33
Hyphen form: 38-BF-33
MAC range: 38:BF:33:00:00:00 – 38:BF:33:FF:FF:FF
Addresses in block: 16,777,216
Organization: NEC CASIO Mobile Communications
Address: 1753,Shimonumabe Kawasaki-shi Kanagawa JP 211-8666
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.

Other prefixes from NEC CASIO Mobile Communications

NEC CASIO Mobile Communications holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

10:0E:2B

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 "NEC CASIO Mobile Communications"
archived source →
2026-07-17Assigned to "NEC CASIO Mobile Communications"

Nearby in the registry

The prefixes assigned immediately before and after 38:BF:33:

FAQ

Which company owns MAC address prefix 38:BF:33?: MAC address prefix 38:BF:33 is registered to NEC CASIO Mobile Communications in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:BF:33 has a network interface built by NEC CASIO Mobile Communications.
What is the OUI 38:BF:33?: 38:BF:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NEC CASIO Mobile Communications. It covers every address from 38:BF:33:00:00:00 to 38:BF:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-BF-33.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 38:BF:33:00:00:00 that is 38:BF:33 — 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 NEC CASIO Mobile Communications located?: NEC CASIO Mobile Communications is listed at 1753,Shimonumabe Kawasaki-shi Kanagawa JP 211-8666 in the IEEE OUI registry entry for 38:BF:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does NEC CASIO Mobile Communications own?: NEC CASIO Mobile Communications holds 2 OUI prefixes in the IEEE registry, of which 38:BF:33 is one. A device made by NEC CASIO Mobile Communications could carry a MAC address from any of them.