Which company owns MAC address prefix 54:9C:27?

MAC address prefix 54:9C:27 is registered to Plasma Cloud Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:9C:27 has a network interface built by Plasma Cloud Limited.

What is the OUI 54:9C:27?

54:9C:27 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Plasma Cloud Limited. It covers every address from 54:9C:27:00:00:00 to 54:9C:27:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-9C-27.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 54:9C:27:00:00:00 that is 54:9C:27 — 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 Plasma Cloud Limited located?

Plasma Cloud Limited is listed at 5/F, Yat Chau Building, 262 Des Voeux Road Central Hong Kong HK NA in the IEEE OUI registry entry for 54:9C:27. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Plasma Cloud Limited

MAC address prefix 54:9C:27 is registered to Plasma Cloud Limited in the IEEE OUI registry. Any device whose MAC address begins with 54:9C:27 has a network interface built by Plasma Cloud Limited. 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 54:9C:27:00:00:00 to 54:9C:27:FF:FF:FF.

OUI prefix: 54:9C:27
Hyphen form: 54-9C-27
MAC range: 54:9C:27:00:00:00 – 54:9C:27:FF:FF:FF
Addresses in block: 16,777,216
Organization: Plasma Cloud Limited
Address: 5/F, Yat Chau Building, 262 Des Voeux Road Central Hong Kong HK NA
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.

2019-07-04Assigned to "Plasma Cloud Limited"
archived source →
2026-07-17Assigned to "Plasma Cloud Limited"

Nearby in the registry

The prefixes assigned immediately before and after 54:9C:27:

FAQ

Which company owns MAC address prefix 54:9C:27?: MAC address prefix 54:9C:27 is registered to Plasma Cloud Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:9C:27 has a network interface built by Plasma Cloud Limited.
What is the OUI 54:9C:27?: 54:9C:27 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Plasma Cloud Limited. It covers every address from 54:9C:27:00:00:00 to 54:9C:27:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-9C-27.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 54:9C:27:00:00:00 that is 54:9C:27 — 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 Plasma Cloud Limited located?: Plasma Cloud Limited is listed at 5/F, Yat Chau Building, 262 Des Voeux Road Central Hong Kong HK NA in the IEEE OUI registry entry for 54:9C:27. This is the address the organization registered with the IEEE, which may differ from its current operating address.