Which company owns MAC address prefix 74:5E:B4?

MAC address prefix 74:5E:B4 is registered to YOKOWO CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:5E:B4 has a network interface built by YOKOWO CO., LTD..

What is the OUI 74:5E:B4?

74:5E:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to YOKOWO CO., LTD.. It covers every address from 74:5E:B4:00:00:00 to 74:5E:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-5E-B4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 74:5E:B4:00:00:00 that is 74:5E:B4 — 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 YOKOWO CO., LTD. located?

YOKOWO CO., LTD. is listed at 5-11, Takinogawa 7-Chome Kita-ku Tokyo JP 114-8515 in the IEEE OUI registry entry for 74:5E:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

YOKOWO CO., LTD.

MAC address prefix 74:5E:B4 is registered to YOKOWO CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with 74:5E:B4 has a network interface built by YOKOWO 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 74:5E:B4:00:00:00 to 74:5E:B4:FF:FF:FF.

OUI prefix: 74:5E:B4
Hyphen form: 74-5E-B4
MAC range: 74:5E:B4:00:00:00 – 74:5E:B4:FF:FF:FF
Addresses in block: 16,777,216
Organization: YOKOWO CO., LTD.
Address: 5-11, Takinogawa 7-Chome Kita-ku Tokyo JP 114-8515
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.

2026-08-04Assigned to "YOKOWO CO., LTD."
archived source →

Nearby in the registry

The prefixes assigned immediately before and after 74:5E:B4:

FAQ

Which company owns MAC address prefix 74:5E:B4?: MAC address prefix 74:5E:B4 is registered to YOKOWO CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:5E:B4 has a network interface built by YOKOWO CO., LTD..
What is the OUI 74:5E:B4?: 74:5E:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to YOKOWO CO., LTD.. It covers every address from 74:5E:B4:00:00:00 to 74:5E:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-5E-B4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 74:5E:B4:00:00:00 that is 74:5E:B4 — 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 YOKOWO CO., LTD. located?: YOKOWO CO., LTD. is listed at 5-11, Takinogawa 7-Chome Kita-ku Tokyo JP 114-8515 in the IEEE OUI registry entry for 74:5E:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.