Which company owns MAC address prefix B8:D3:EF?

MAC address prefix B8:D3:EF is registered to UNISEM (M) BERHAD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:D3:EF has a network interface built by UNISEM (M) BERHAD.

What is the OUI B8:D3:EF?

B8:D3:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to UNISEM (M) BERHAD. It covers every address from B8:D3:EF:00:00:00 to B8:D3:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-D3-EF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B8:D3:EF:00:00:00 that is B8:D3:EF — 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 UNISEM (M) BERHAD located?

UNISEM (M) BERHAD is listed at LOT 302285, JALAN INDUSTRI 1/1, KAWASAN PERINDUSTRIAN GOPENG, GOPENG PERAK MY 31600 in the IEEE OUI registry entry for B8:D3:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

UNISEM (M) BERHAD

MAC address prefix B8:D3:EF is registered to UNISEM (M) BERHAD in the IEEE OUI registry. Any device whose MAC address begins with B8:D3:EF has a network interface built by UNISEM (M) BERHAD. 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 B8:D3:EF:00:00:00 to B8:D3:EF:FF:FF:FF.

OUI prefix: B8:D3:EF
Hyphen form: B8-D3-EF
MAC range: B8:D3:EF:00:00:00 – B8:D3:EF:FF:FF:FF
Addresses in block: 16,777,216
Organization: UNISEM (M) BERHAD
Address: LOT 302285, JALAN INDUSTRI 1/1, KAWASAN PERINDUSTRIAN GOPENG, GOPENG PERAK MY 31600
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.

2026-06-20Assigned to "UNISEM (M) BERHAD"
archived source →
2026-07-17Assigned to "UNISEM (M) BERHAD"

Nearby in the registry

The prefixes assigned immediately before and after B8:D3:EF:

FAQ

Which company owns MAC address prefix B8:D3:EF?: MAC address prefix B8:D3:EF is registered to UNISEM (M) BERHAD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:D3:EF has a network interface built by UNISEM (M) BERHAD.
What is the OUI B8:D3:EF?: B8:D3:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to UNISEM (M) BERHAD. It covers every address from B8:D3:EF:00:00:00 to B8:D3:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-D3-EF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B8:D3:EF:00:00:00 that is B8:D3:EF — 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 UNISEM (M) BERHAD located?: UNISEM (M) BERHAD is listed at LOT 302285, JALAN INDUSTRI 1/1, KAWASAN PERINDUSTRIAN GOPENG, GOPENG PERAK MY 31600 in the IEEE OUI registry entry for B8:D3:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.