Which company owns MAC address prefix A8:C2:22?

MAC address prefix A8:C2:22 is registered to TM-Research Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:C2:22 has a network interface built by TM-Research Inc..

What is the OUI A8:C2:22?

A8:C2:22 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TM-Research Inc.. It covers every address from A8:C2:22:00:00:00 to A8:C2:22:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-C2-22.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A8:C2:22:00:00:00 that is A8:C2:22 — 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 TM-Research Inc. located?

TM-Research Inc. is listed at Hiyoshi Honcho 1-15-4 Yokohama Kanagawa JP 223-0062 in the IEEE OUI registry entry for A8:C2:22. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TM-Research Inc.

MAC address prefix A8:C2:22 is registered to TM-Research Inc. in the IEEE OUI registry. Any device whose MAC address begins with A8:C2:22 has a network interface built by TM-Research Inc.. 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 A8:C2:22:00:00:00 to A8:C2:22:FF:FF:FF.

OUI prefix: A8:C2:22
Hyphen form: A8-C2-22
MAC range: A8:C2:22:00:00:00 – A8:C2:22:FF:FF:FF
Addresses in block: 16,777,216
Organization: TM-Research Inc.
Address: Hiyoshi Honcho 1-15-4 Yokohama Kanagawa JP 223-0062
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 "TM-Research Inc."
archived source →
2026-07-17Assigned to "TM-Research Inc."

Nearby in the registry

The prefixes assigned immediately before and after A8:C2:22:

FAQ

Which company owns MAC address prefix A8:C2:22?: MAC address prefix A8:C2:22 is registered to TM-Research Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:C2:22 has a network interface built by TM-Research Inc..
What is the OUI A8:C2:22?: A8:C2:22 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TM-Research Inc.. It covers every address from A8:C2:22:00:00:00 to A8:C2:22:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-C2-22.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A8:C2:22:00:00:00 that is A8:C2:22 — 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 TM-Research Inc. located?: TM-Research Inc. is listed at Hiyoshi Honcho 1-15-4 Yokohama Kanagawa JP 223-0062 in the IEEE OUI registry entry for A8:C2:22. This is the address the organization registered with the IEEE, which may differ from its current operating address.