Which company owns MAC address prefix E8:EF:89?

MAC address prefix E8:EF:89 is registered to OPMEX Tech. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:EF:89 has a network interface built by OPMEX Tech..

What is the OUI E8:EF:89?

E8:EF:89 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to OPMEX Tech.. It covers every address from E8:EF:89:00:00:00 to E8:EF:89:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-EF-89.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E8:EF:89:00:00:00 that is E8:EF:89 — 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 OPMEX Tech. located?

OPMEX Tech. is listed at 18F GDC Building, 9 Gaoxin Central Avenue 3rd, Nanshan District Shenzhen Guangdong CN 518000 in the IEEE OUI registry entry for E8:EF:89. This is the address the organization registered with the IEEE, which may differ from its current operating address.

OPMEX Tech.

MAC address prefix E8:EF:89 is registered to OPMEX Tech. in the IEEE OUI registry. Any device whose MAC address begins with E8:EF:89 has a network interface built by OPMEX Tech.. 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:EF:89:00:00:00 to E8:EF:89:FF:FF:FF.

OUI prefix: E8:EF:89
Hyphen form: E8-EF-89
MAC range: E8:EF:89:00:00:00 – E8:EF:89:FF:FF:FF
Addresses in block: 16,777,216
Organization: OPMEX Tech.
Address: 18F GDC Building, 9 Gaoxin Central Avenue 3rd, Nanshan District Shenzhen Guangdong CN 518000
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 "OPMEX Tech."
archived source →
2026-07-17Assigned to "OPMEX Tech."

Nearby in the registry

The prefixes assigned immediately before and after E8:EF:89:

FAQ

Which company owns MAC address prefix E8:EF:89?: MAC address prefix E8:EF:89 is registered to OPMEX Tech. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:EF:89 has a network interface built by OPMEX Tech..
What is the OUI E8:EF:89?: E8:EF:89 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to OPMEX Tech.. It covers every address from E8:EF:89:00:00:00 to E8:EF:89:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-EF-89.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E8:EF:89:00:00:00 that is E8:EF:89 — 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 OPMEX Tech. located?: OPMEX Tech. is listed at 18F GDC Building, 9 Gaoxin Central Avenue 3rd, Nanshan District Shenzhen Guangdong CN 518000 in the IEEE OUI registry entry for E8:EF:89. This is the address the organization registered with the IEEE, which may differ from its current operating address.