Which company owns MAC address prefix E8:28:77?

MAC address prefix E8:28:77 is registered to TMY Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:28:77 has a network interface built by TMY Co., Ltd..

What is the OUI E8:28:77?

E8:28:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TMY Co., Ltd.. It covers every address from E8:28:77:00:00:00 to E8:28:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-28-77.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E8:28:77:00:00:00 that is E8:28:77 — 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 TMY Co., Ltd. located?

TMY Co., Ltd. is listed at Attic Bldg. 3F, 1-2-10 Ise-cho, Ashikaga-shi Tochigi JP 326-0053 in the IEEE OUI registry entry for E8:28:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TMY Co., Ltd.

MAC address prefix E8:28:77 is registered to TMY Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with E8:28:77 has a network interface built by TMY 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 E8:28:77:00:00:00 to E8:28:77:FF:FF:FF.

OUI prefix: E8:28:77
Hyphen form: E8-28-77
MAC range: E8:28:77:00:00:00 – E8:28:77:FF:FF:FF
Addresses in block: 16,777,216
Organization: TMY Co., Ltd.
Address: Attic Bldg. 3F, 1-2-10 Ise-cho, Ashikaga-shi Tochigi JP 326-0053
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 "TMY Co., Ltd."
archived source →
2026-07-17Assigned to "TMY Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after E8:28:77:

FAQ

Which company owns MAC address prefix E8:28:77?: MAC address prefix E8:28:77 is registered to TMY Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:28:77 has a network interface built by TMY Co., Ltd..
What is the OUI E8:28:77?: E8:28:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TMY Co., Ltd.. It covers every address from E8:28:77:00:00:00 to E8:28:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-28-77.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E8:28:77:00:00:00 that is E8:28:77 — 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 TMY Co., Ltd. located?: TMY Co., Ltd. is listed at Attic Bldg. 3F, 1-2-10 Ise-cho, Ashikaga-shi Tochigi JP 326-0053 in the IEEE OUI registry entry for E8:28:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.