Which company owns MAC address prefix 64:21:84?

MAC address prefix 64:21:84 is registered to Nippon Denki Kagaku Co.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:21:84 has a network interface built by Nippon Denki Kagaku Co.,LTD.

What is the OUI 64:21:84?

64:21:84 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nippon Denki Kagaku Co.,LTD. It covers every address from 64:21:84:00:00:00 to 64:21:84:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-21-84.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 64:21:84:00:00:00 that is 64:21:84 — 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 Nippon Denki Kagaku Co.,LTD located?

Nippon Denki Kagaku Co.,LTD is listed at Nishino Gotochou 18 Kyoto City Kyoto Pref JP 607-8356 in the IEEE OUI registry entry for 64:21:84. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Nippon Denki Kagaku Co.,LTD

MAC address prefix 64:21:84 is registered to Nippon Denki Kagaku Co.,LTD in the IEEE OUI registry. Any device whose MAC address begins with 64:21:84 has a network interface built by Nippon Denki Kagaku 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 64:21:84:00:00:00 to 64:21:84:FF:FF:FF.

OUI prefix: 64:21:84
Hyphen form: 64-21-84
MAC range: 64:21:84:00:00:00 – 64:21:84:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nippon Denki Kagaku Co.,LTD
Address: Nishino Gotochou 18 Kyoto City Kyoto Pref JP 607-8356
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 "Nippon Denki Kagaku Co.,LTD"
archived source →
2026-07-17Assigned to "Nippon Denki Kagaku Co.,LTD"

Nearby in the registry

The prefixes assigned immediately before and after 64:21:84:

FAQ

Which company owns MAC address prefix 64:21:84?: MAC address prefix 64:21:84 is registered to Nippon Denki Kagaku Co.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:21:84 has a network interface built by Nippon Denki Kagaku Co.,LTD.
What is the OUI 64:21:84?: 64:21:84 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nippon Denki Kagaku Co.,LTD. It covers every address from 64:21:84:00:00:00 to 64:21:84:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-21-84.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 64:21:84:00:00:00 that is 64:21:84 — 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 Nippon Denki Kagaku Co.,LTD located?: Nippon Denki Kagaku Co.,LTD is listed at Nishino Gotochou 18 Kyoto City Kyoto Pref JP 607-8356 in the IEEE OUI registry entry for 64:21:84. This is the address the organization registered with the IEEE, which may differ from its current operating address.