Which company owns MAC address prefix 84:6A:66?

MAC address prefix 84:6A:66 is registered to Sumitomo Kizai Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:6A:66 has a network interface built by Sumitomo Kizai Co.,Ltd..

What is the OUI 84:6A:66?

84:6A:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sumitomo Kizai Co.,Ltd.. It covers every address from 84:6A:66:00:00:00 to 84:6A:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-6A-66.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:6A:66:00:00:00 that is 84:6A:66 — 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 Sumitomo Kizai Co.,Ltd. located?

Sumitomo Kizai Co.,Ltd. is listed at 1-45-1higashiikebukuro tosimaku tokyo JP 170-0013 in the IEEE OUI registry entry for 84:6A:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sumitomo Kizai Co.,Ltd.

MAC address prefix 84:6A:66 is registered to Sumitomo Kizai Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 84:6A:66 has a network interface built by Sumitomo Kizai 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 84:6A:66:00:00:00 to 84:6A:66:FF:FF:FF.

OUI prefix: 84:6A:66
Hyphen form: 84-6A-66
MAC range: 84:6A:66:00:00:00 – 84:6A:66:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sumitomo Kizai Co.,Ltd.
Address: 1-45-1higashiikebukuro tosimaku tokyo JP 170-0013
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.

2018-12-21Assigned to "Sumitomo Kizai Co.,Ltd."
archived source →
2026-07-17Assigned to "Sumitomo Kizai Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 84:6A:66:

FAQ

Which company owns MAC address prefix 84:6A:66?: MAC address prefix 84:6A:66 is registered to Sumitomo Kizai Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:6A:66 has a network interface built by Sumitomo Kizai Co.,Ltd..
What is the OUI 84:6A:66?: 84:6A:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sumitomo Kizai Co.,Ltd.. It covers every address from 84:6A:66:00:00:00 to 84:6A:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-6A-66.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:6A:66:00:00:00 that is 84:6A:66 — 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 Sumitomo Kizai Co.,Ltd. located?: Sumitomo Kizai Co.,Ltd. is listed at 1-45-1higashiikebukuro tosimaku tokyo JP 170-0013 in the IEEE OUI registry entry for 84:6A:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.