Which company owns MAC address prefix E8:28:D5?

MAC address prefix E8:28:D5 is registered to Cots Technology in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:28:D5 has a network interface built by Cots Technology.

What is the OUI E8:28:D5?

E8:28:D5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cots Technology. It covers every address from E8:28:D5:00:00:00 to E8:28:D5:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-28-D5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E8:28:D5:00:00:00 that is E8:28:D5 — 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 Cots Technology located?

Cots Technology is listed at C-702, Bundang Techno Park, 145, Sungnam-City Kyounggi-do KR 463-760 in the IEEE OUI registry entry for E8:28:D5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cots Technology

MAC address prefix E8:28:D5 is registered to Cots Technology in the IEEE OUI registry. Any device whose MAC address begins with E8:28:D5 has a network interface built by Cots Technology. 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:D5:00:00:00 to E8:28:D5:FF:FF:FF.

OUI prefix: E8:28:D5
Hyphen form: E8-28-D5
MAC range: E8:28:D5:00:00:00 – E8:28:D5:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cots Technology
Address: C-702, Bundang Techno Park, 145, Sungnam-City Kyounggi-do KR 463-760
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 "Cots Technology"
archived source →
2026-07-17Assigned to "Cots Technology"

Nearby in the registry

The prefixes assigned immediately before and after E8:28:D5:

FAQ

Which company owns MAC address prefix E8:28:D5?: MAC address prefix E8:28:D5 is registered to Cots Technology in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:28:D5 has a network interface built by Cots Technology.
What is the OUI E8:28:D5?: E8:28:D5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cots Technology. It covers every address from E8:28:D5:00:00:00 to E8:28:D5:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-28-D5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E8:28:D5:00:00:00 that is E8:28:D5 — 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 Cots Technology located?: Cots Technology is listed at C-702, Bundang Techno Park, 145, Sungnam-City Kyounggi-do KR 463-760 in the IEEE OUI registry entry for E8:28:D5. This is the address the organization registered with the IEEE, which may differ from its current operating address.