Which company owns MAC address prefix F8:9F:B8?

MAC address prefix F8:9F:B8 is registered to YAZAKI Energy System Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:9F:B8 has a network interface built by YAZAKI Energy System Corporation.

What is the OUI F8:9F:B8?

F8:9F:B8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to YAZAKI Energy System Corporation. It covers every address from F8:9F:B8:00:00:00 to F8:9F:B8:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-9F-B8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F8:9F:B8:00:00:00 that is F8:9F:B8 — 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 YAZAKI Energy System Corporation located?

YAZAKI Energy System Corporation is listed at 1-7-1 YOKOI Shimada -shi,Shizuoka JP 427-8555 in the IEEE OUI registry entry for F8:9F:B8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

YAZAKI Energy System Corporation

MAC address prefix F8:9F:B8 is registered to YAZAKI Energy System Corporation in the IEEE OUI registry. Any device whose MAC address begins with F8:9F:B8 has a network interface built by YAZAKI Energy System 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 F8:9F:B8:00:00:00 to F8:9F:B8:FF:FF:FF.

OUI prefix: F8:9F:B8
Hyphen form: F8-9F-B8
MAC range: F8:9F:B8:00:00:00 – F8:9F:B8:FF:FF:FF
Addresses in block: 16,777,216
Organization: YAZAKI Energy System Corporation
Address: 1-7-1 YOKOI Shimada -shi,Shizuoka JP 427-8555
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 "YAZAKI Energy System Corporation"
archived source →
2026-07-17Assigned to "YAZAKI Energy System Corporation"

Nearby in the registry

The prefixes assigned immediately before and after F8:9F:B8:

FAQ

Which company owns MAC address prefix F8:9F:B8?: MAC address prefix F8:9F:B8 is registered to YAZAKI Energy System Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:9F:B8 has a network interface built by YAZAKI Energy System Corporation.
What is the OUI F8:9F:B8?: F8:9F:B8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to YAZAKI Energy System Corporation. It covers every address from F8:9F:B8:00:00:00 to F8:9F:B8:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-9F-B8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F8:9F:B8:00:00:00 that is F8:9F:B8 — 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 YAZAKI Energy System Corporation located?: YAZAKI Energy System Corporation is listed at 1-7-1 YOKOI Shimada -shi,Shizuoka JP 427-8555 in the IEEE OUI registry entry for F8:9F:B8. This is the address the organization registered with the IEEE, which may differ from its current operating address.