Which company owns MAC address prefix F8:42:FB?

MAC address prefix F8:42:FB is registered to Yasuda Joho Co.,ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:42:FB has a network interface built by Yasuda Joho Co.,ltd..

What is the OUI F8:42:FB?

F8:42:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yasuda Joho Co.,ltd.. It covers every address from F8:42:FB:00:00:00 to F8:42:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-42-FB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F8:42:FB:00:00:00 that is F8:42:FB — 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 Yasuda Joho Co.,ltd. located?

Yasuda Joho Co.,ltd. is listed at 1-11-1 Minato-ku Tokyo JP 105-0022 in the IEEE OUI registry entry for F8:42:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Yasuda Joho Co.,ltd.

MAC address prefix F8:42:FB is registered to Yasuda Joho Co.,ltd. in the IEEE OUI registry. Any device whose MAC address begins with F8:42:FB has a network interface built by Yasuda Joho 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 F8:42:FB:00:00:00 to F8:42:FB:FF:FF:FF.

OUI prefix: F8:42:FB
Hyphen form: F8-42-FB
MAC range: F8:42:FB:00:00:00 – F8:42:FB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Yasuda Joho Co.,ltd.
Address: 1-11-1 Minato-ku Tokyo JP 105-0022
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 "Yasuda Joho Co.,ltd."
archived source →
2026-07-17Assigned to "Yasuda Joho Co.,ltd."

Nearby in the registry

The prefixes assigned immediately before and after F8:42:FB:

FAQ

Which company owns MAC address prefix F8:42:FB?: MAC address prefix F8:42:FB is registered to Yasuda Joho Co.,ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:42:FB has a network interface built by Yasuda Joho Co.,ltd..
What is the OUI F8:42:FB?: F8:42:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yasuda Joho Co.,ltd.. It covers every address from F8:42:FB:00:00:00 to F8:42:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-42-FB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F8:42:FB:00:00:00 that is F8:42:FB — 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 Yasuda Joho Co.,ltd. located?: Yasuda Joho Co.,ltd. is listed at 1-11-1 Minato-ku Tokyo JP 105-0022 in the IEEE OUI registry entry for F8:42:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.