Which company owns MAC address prefix DC:1D:9F?

MAC address prefix DC:1D:9F is registered to U & B tech in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:1D:9F has a network interface built by U & B tech.

What is the OUI DC:1D:9F?

DC:1D:9F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to U & B tech. It covers every address from DC:1D:9F:00:00:00 to DC:1D:9F:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-1D-9F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:1D:9F:00:00:00 that is DC:1D: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 U & B tech located?

U & B tech is listed at 2F, Daeyoung buliding, 1423-6, Kwanyang-1Dong, Anyang-Si Gyeonggi-Do KR 431-061 in the IEEE OUI registry entry for DC:1D:9F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

U & B tech

MAC address prefix DC:1D:9F is registered to U & B tech in the IEEE OUI registry. Any device whose MAC address begins with DC:1D:9F has a network interface built by U & B tech. 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 DC:1D:9F:00:00:00 to DC:1D:9F:FF:FF:FF.

OUI prefix: DC:1D:9F
Hyphen form: DC-1D-9F
MAC range: DC:1D:9F:00:00:00 – DC:1D:9F:FF:FF:FF
Addresses in block: 16,777,216
Organization: U & B tech
Address: 2F, Daeyoung buliding, 1423-6, Kwanyang-1Dong, Anyang-Si Gyeonggi-Do KR 431-061
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 "U & B tech"
archived source →
2026-07-17Assigned to "U & B tech"

Nearby in the registry

The prefixes assigned immediately before and after DC:1D:9F:

FAQ

Which company owns MAC address prefix DC:1D:9F?: MAC address prefix DC:1D:9F is registered to U & B tech in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:1D:9F has a network interface built by U & B tech.
What is the OUI DC:1D:9F?: DC:1D:9F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to U & B tech. It covers every address from DC:1D:9F:00:00:00 to DC:1D:9F:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-1D-9F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:1D:9F:00:00:00 that is DC:1D: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 U & B tech located?: U & B tech is listed at 2F, Daeyoung buliding, 1423-6, Kwanyang-1Dong, Anyang-Si Gyeonggi-Do KR 431-061 in the IEEE OUI registry entry for DC:1D:9F. This is the address the organization registered with the IEEE, which may differ from its current operating address.