Which company owns MAC address prefix B0:6B:B3?

MAC address prefix B0:6B:B3 is registered to GRT in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:6B:B3 has a network interface built by GRT.

What is the OUI B0:6B:B3?

B0:6B:B3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GRT. It covers every address from B0:6B:B3:00:00:00 to B0:6B:B3:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-6B-B3.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:6B:B3:00:00:00 that is B0:6B:B3 — 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 GRT located?

GRT is listed at Unit 01, 10/F Carnival Comm BLDG 18 Java RD,North Point, Hong Kong Hong Kong HK 100036 in the IEEE OUI registry entry for B0:6B:B3. This is the address the organization registered with the IEEE, which may differ from its current operating address.

GRT

MAC address prefix B0:6B:B3 is registered to GRT in the IEEE OUI registry. Any device whose MAC address begins with B0:6B:B3 has a network interface built by GRT. 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 B0:6B:B3:00:00:00 to B0:6B:B3:FF:FF:FF.

OUI prefix: B0:6B:B3
Hyphen form: B0-6B-B3
MAC range: B0:6B:B3:00:00:00 – B0:6B:B3:FF:FF:FF
Addresses in block: 16,777,216
Organization: GRT
Address: Unit 01, 10/F Carnival Comm BLDG 18 Java RD,North Point, Hong Kong Hong Kong HK 100036
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.

2022-09-05Assigned to "GRT"
archived source →
2026-07-17Assigned to "GRT"

Nearby in the registry

The prefixes assigned immediately before and after B0:6B:B3:

FAQ

Which company owns MAC address prefix B0:6B:B3?: MAC address prefix B0:6B:B3 is registered to GRT in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:6B:B3 has a network interface built by GRT.
What is the OUI B0:6B:B3?: B0:6B:B3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GRT. It covers every address from B0:6B:B3:00:00:00 to B0:6B:B3:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-6B-B3.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:6B:B3:00:00:00 that is B0:6B:B3 — 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 GRT located?: GRT is listed at Unit 01, 10/F Carnival Comm BLDG 18 Java RD,North Point, Hong Kong Hong Kong HK 100036 in the IEEE OUI registry entry for B0:6B:B3. This is the address the organization registered with the IEEE, which may differ from its current operating address.