Which company owns MAC address prefix 28:F4:9B?

MAC address prefix 28:F4:9B is registered to LEETEK in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:F4:9B has a network interface built by LEETEK.

What is the OUI 28:F4:9B?

28:F4:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LEETEK. It covers every address from 28:F4:9B:00:00:00 to 28:F4:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-F4-9B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:F4:9B:00:00:00 that is 28:F4:9B — 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 LEETEK located?

LEETEK is listed at Ojeong-ro, 47 Bucheon-si Gyeonggi-do KR 14445 in the IEEE OUI registry entry for 28:F4:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

LEETEK

MAC address prefix 28:F4:9B is registered to LEETEK in the IEEE OUI registry. Any device whose MAC address begins with 28:F4:9B has a network interface built by LEETEK. 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 28:F4:9B:00:00:00 to 28:F4:9B:FF:FF:FF.

OUI prefix: 28:F4:9B
Hyphen form: 28-F4-9B
MAC range: 28:F4:9B:00:00:00 – 28:F4:9B:FF:FF:FF
Addresses in block: 16,777,216
Organization: LEETEK
Address: Ojeong-ro, 47 Bucheon-si Gyeonggi-do KR 14445
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.

2021-02-25Assigned to "LEETEK"
archived source →
2026-07-17Assigned to "LEETEK"

Nearby in the registry

The prefixes assigned immediately before and after 28:F4:9B:

FAQ

Which company owns MAC address prefix 28:F4:9B?: MAC address prefix 28:F4:9B is registered to LEETEK in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:F4:9B has a network interface built by LEETEK.
What is the OUI 28:F4:9B?: 28:F4:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LEETEK. It covers every address from 28:F4:9B:00:00:00 to 28:F4:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-F4-9B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:F4:9B:00:00:00 that is 28:F4:9B — 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 LEETEK located?: LEETEK is listed at Ojeong-ro, 47 Bucheon-si Gyeonggi-do KR 14445 in the IEEE OUI registry entry for 28:F4:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.