Which company owns MAC address prefix D4:4B:5E?

MAC address prefix D4:4B:5E is registered to TAIYO YUDEN CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:4B:5E has a network interface built by TAIYO YUDEN CO., LTD..

What is the OUI D4:4B:5E?

D4:4B:5E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TAIYO YUDEN CO., LTD.. It covers every address from D4:4B:5E:00:00:00 to D4:4B:5E:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-4B-5E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:4B:5E:00:00:00 that is D4:4B:5E — 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 TAIYO YUDEN CO., LTD. located?

TAIYO YUDEN CO., LTD. is listed at 8-1, Sakae-cho Takasaki-shi Gunma JP 370-8522 in the IEEE OUI registry entry for D4:4B:5E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TAIYO YUDEN CO., LTD.

MAC address prefix D4:4B:5E is registered to TAIYO YUDEN CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with D4:4B:5E has a network interface built by TAIYO YUDEN 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 D4:4B:5E:00:00:00 to D4:4B:5E:FF:FF:FF.

OUI prefix: D4:4B:5E
Hyphen form: D4-4B-5E
MAC range: D4:4B:5E:00:00:00 – D4:4B:5E:FF:FF:FF
Addresses in block: 16,777,216
Organization: TAIYO YUDEN CO., LTD.
Address: 8-1, Sakae-cho Takasaki-shi Gunma JP 370-8522
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 "TAIYO YUDEN CO., LTD."
archived source →
2026-07-17Assigned to "TAIYO YUDEN CO., LTD."

Nearby in the registry

The prefixes assigned immediately before and after D4:4B:5E:

FAQ

Which company owns MAC address prefix D4:4B:5E?: MAC address prefix D4:4B:5E is registered to TAIYO YUDEN CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:4B:5E has a network interface built by TAIYO YUDEN CO., LTD..
What is the OUI D4:4B:5E?: D4:4B:5E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TAIYO YUDEN CO., LTD.. It covers every address from D4:4B:5E:00:00:00 to D4:4B:5E:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-4B-5E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:4B:5E:00:00:00 that is D4:4B:5E — 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 TAIYO YUDEN CO., LTD. located?: TAIYO YUDEN CO., LTD. is listed at 8-1, Sakae-cho Takasaki-shi Gunma JP 370-8522 in the IEEE OUI registry entry for D4:4B:5E. This is the address the organization registered with the IEEE, which may differ from its current operating address.