Which company owns MAC address prefix 78:D9:9F?

MAC address prefix 78:D9:9F is registered to NuCom HK Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:D9:9F has a network interface built by NuCom HK Ltd..

What is the OUI 78:D9:9F?

78:D9:9F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NuCom HK Ltd.. It covers every address from 78:D9:9F:00:00:00 to 78:D9:9F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-D9-9F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:D9:9F:00:00:00 that is 78:D9:9F — 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 NuCom HK Ltd. located?

NuCom HK Ltd. is listed at Unit B 11/F, Eton Bldg, 288 Des Voeux Rd. Central Hong Kong Hong Kong CN 00852 in the IEEE OUI registry entry for 78:D9:9F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

NuCom HK Ltd.

MAC address prefix 78:D9:9F is registered to NuCom HK Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 78:D9:9F has a network interface built by NuCom HK 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 78:D9:9F:00:00:00 to 78:D9:9F:FF:FF:FF.

OUI prefix: 78:D9:9F
Hyphen form: 78-D9-9F
MAC range: 78:D9:9F:00:00:00 – 78:D9:9F:FF:FF:FF
Addresses in block: 16,777,216
Organization: NuCom HK Ltd.
Address: Unit B 11/F, Eton Bldg, 288 Des Voeux Rd. Central Hong Kong Hong Kong CN 00852
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 "NuCom HK Ltd."
archived source →
2026-07-17Assigned to "NuCom HK Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 78:D9:9F:

FAQ

Which company owns MAC address prefix 78:D9:9F?: MAC address prefix 78:D9:9F is registered to NuCom HK Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:D9:9F has a network interface built by NuCom HK Ltd..
What is the OUI 78:D9:9F?: 78:D9:9F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NuCom HK Ltd.. It covers every address from 78:D9:9F:00:00:00 to 78:D9:9F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-D9-9F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:D9:9F:00:00:00 that is 78:D9:9F — 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 NuCom HK Ltd. located?: NuCom HK Ltd. is listed at Unit B 11/F, Eton Bldg, 288 Des Voeux Rd. Central Hong Kong Hong Kong CN 00852 in the IEEE OUI registry entry for 78:D9:9F. This is the address the organization registered with the IEEE, which may differ from its current operating address.