Which company owns MAC address prefix F0:23:29?

MAC address prefix F0:23:29 is registered to SHOWA DENKI CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:23:29 has a network interface built by SHOWA DENKI CO.,LTD..

What is the OUI F0:23:29?

F0:23:29 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SHOWA DENKI CO.,LTD.. It covers every address from F0:23:29:00:00:00 to F0:23:29:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-23-29.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F0:23:29:00:00:00 that is F0:23:29 — 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 SHOWA DENKI CO.,LTD. located?

SHOWA DENKI CO.,LTD. is listed at 1-25 Daito-city Osaka JP 574-0052 in the IEEE OUI registry entry for F0:23:29. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SHOWA DENKI CO.,LTD.

MAC address prefix F0:23:29 is registered to SHOWA DENKI CO.,LTD. in the IEEE OUI registry. Any device whose MAC address begins with F0:23:29 has a network interface built by SHOWA DENKI 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 F0:23:29:00:00:00 to F0:23:29:FF:FF:FF.

OUI prefix: F0:23:29
Hyphen form: F0-23-29
MAC range: F0:23:29:00:00:00 – F0:23:29:FF:FF:FF
Addresses in block: 16,777,216
Organization: SHOWA DENKI CO.,LTD.
Address: 1-25 Daito-city Osaka JP 574-0052
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 "SHOWA DENKI CO.,LTD."
archived source →
2026-07-17Assigned to "SHOWA DENKI CO.,LTD."

Nearby in the registry

The prefixes assigned immediately before and after F0:23:29:

FAQ

Which company owns MAC address prefix F0:23:29?: MAC address prefix F0:23:29 is registered to SHOWA DENKI CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:23:29 has a network interface built by SHOWA DENKI CO.,LTD..
What is the OUI F0:23:29?: F0:23:29 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SHOWA DENKI CO.,LTD.. It covers every address from F0:23:29:00:00:00 to F0:23:29:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-23-29.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F0:23:29:00:00:00 that is F0:23:29 — 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 SHOWA DENKI CO.,LTD. located?: SHOWA DENKI CO.,LTD. is listed at 1-25 Daito-city Osaka JP 574-0052 in the IEEE OUI registry entry for F0:23:29. This is the address the organization registered with the IEEE, which may differ from its current operating address.