Which company owns MAC address prefix DC:B4:C4?

MAC address prefix DC:B4:C4 is registered to Microsoft XCG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:B4:C4 has a network interface built by Microsoft XCG.

What is the OUI DC:B4:C4?

DC:B4:C4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Microsoft XCG. It covers every address from DC:B4:C4:00:00:00 to DC:B4:C4:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-B4-C4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:B4:C4:00:00:00 that is DC:B4:C4 — 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 Microsoft XCG located?

Microsoft XCG is listed at 1 Microsoft Way Redmond WA US 98052 in the IEEE OUI registry entry for DC:B4:C4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Microsoft XCG

MAC address prefix DC:B4:C4 is registered to Microsoft XCG in the IEEE OUI registry. Any device whose MAC address begins with DC:B4:C4 has a network interface built by Microsoft XCG. 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:B4:C4:00:00:00 to DC:B4:C4:FF:FF:FF.

OUI prefix: DC:B4:C4
Hyphen form: DC-B4-C4
MAC range: DC:B4:C4:00:00:00 – DC:B4:C4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Microsoft XCG
Address: 1 Microsoft Way Redmond WA US 98052
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 "Microsoft XCG"
archived source →
2026-07-17Assigned to "Microsoft XCG"

Nearby in the registry

The prefixes assigned immediately before and after DC:B4:C4:

FAQ

Which company owns MAC address prefix DC:B4:C4?: MAC address prefix DC:B4:C4 is registered to Microsoft XCG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:B4:C4 has a network interface built by Microsoft XCG.
What is the OUI DC:B4:C4?: DC:B4:C4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Microsoft XCG. It covers every address from DC:B4:C4:00:00:00 to DC:B4:C4:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-B4-C4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:B4:C4:00:00:00 that is DC:B4:C4 — 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 Microsoft XCG located?: Microsoft XCG is listed at 1 Microsoft Way Redmond WA US 98052 in the IEEE OUI registry entry for DC:B4:C4. This is the address the organization registered with the IEEE, which may differ from its current operating address.