Which company owns MAC address prefix 54:D9:E4?

MAC address prefix 54:D9:E4 is registered to BRILLIANTTS CO., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:D9:E4 has a network interface built by BRILLIANTTS CO., LTD.

What is the OUI 54:D9:E4?

54:D9:E4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BRILLIANTTS CO., LTD. It covers every address from 54:D9:E4:00:00:00 to 54:D9:E4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-D9-E4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 54:D9:E4:00:00:00 that is 54:D9:E4 — 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 BRILLIANTTS CO., LTD located?

BRILLIANTTS CO., LTD is listed at Daewangpangyo-ro Seongnam-si KR 13494 in the IEEE OUI registry entry for 54:D9:E4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

BRILLIANTTS CO., LTD

MAC address prefix 54:D9:E4 is registered to BRILLIANTTS CO., LTD in the IEEE OUI registry. Any device whose MAC address begins with 54:D9:E4 has a network interface built by BRILLIANTTS 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 54:D9:E4:00:00:00 to 54:D9:E4:FF:FF:FF.

OUI prefix: 54:D9:E4
Hyphen form: 54-D9-E4
MAC range: 54:D9:E4:00:00:00 – 54:D9:E4:FF:FF:FF
Addresses in block: 16,777,216
Organization: BRILLIANTTS CO., LTD
Address: Daewangpangyo-ro Seongnam-si KR 13494
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 "BRILLIANTTS CO., LTD"
archived source →
2026-07-17Assigned to "BRILLIANTTS CO., LTD"

Nearby in the registry

The prefixes assigned immediately before and after 54:D9:E4:

FAQ

Which company owns MAC address prefix 54:D9:E4?: MAC address prefix 54:D9:E4 is registered to BRILLIANTTS CO., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:D9:E4 has a network interface built by BRILLIANTTS CO., LTD.
What is the OUI 54:D9:E4?: 54:D9:E4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BRILLIANTTS CO., LTD. It covers every address from 54:D9:E4:00:00:00 to 54:D9:E4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-D9-E4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 54:D9:E4:00:00:00 that is 54:D9:E4 — 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 BRILLIANTTS CO., LTD located?: BRILLIANTTS CO., LTD is listed at Daewangpangyo-ro Seongnam-si KR 13494 in the IEEE OUI registry entry for 54:D9:E4. This is the address the organization registered with the IEEE, which may differ from its current operating address.