Which company owns MAC address prefix 00:00:56?

MAC address prefix 00:00:56 is registered to DR. B. STRUCK in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:00:56 has a network interface built by DR. B. STRUCK.

What is the OUI 00:00:56?

00:00:56 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DR. B. STRUCK. It covers every address from 00:00:56:00:00:00 to 00:00:56:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-00-56.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:00:56:00:00:00 that is 00:00:56 — 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 DR. B. STRUCK located?

DR. B. STRUCK is listed at POB 1147 BAECKERBARG 6 DE W-GERMANY in the IEEE OUI registry entry for 00:00:56. This is the address the organization registered with the IEEE, which may differ from its current operating address.

DR. B. STRUCK

MAC address prefix 00:00:56 is registered to DR. B. STRUCK in the IEEE OUI registry. Any device whose MAC address begins with 00:00:56 has a network interface built by DR. B. STRUCK. 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 00:00:56:00:00:00 to 00:00:56:FF:FF:FF.

OUI prefix: 00:00:56
Hyphen form: 00-00-56
MAC range: 00:00:56:00:00:00 – 00:00:56:FF:FF:FF
Addresses in block: 16,777,216
Organization: DR. B. STRUCK
Address: POB 1147 BAECKERBARG 6 DE W-GERMANY
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 "DR. B. STRUCK"
archived source →
2026-07-17Assigned to "DR. B. STRUCK"

Nearby in the registry

The prefixes assigned immediately before and after 00:00:56:

FAQ

Which company owns MAC address prefix 00:00:56?: MAC address prefix 00:00:56 is registered to DR. B. STRUCK in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:00:56 has a network interface built by DR. B. STRUCK.
What is the OUI 00:00:56?: 00:00:56 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DR. B. STRUCK. It covers every address from 00:00:56:00:00:00 to 00:00:56:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-00-56.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:00:56:00:00:00 that is 00:00:56 — 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 DR. B. STRUCK located?: DR. B. STRUCK is listed at POB 1147 BAECKERBARG 6 DE W-GERMANY in the IEEE OUI registry entry for 00:00:56. This is the address the organization registered with the IEEE, which may differ from its current operating address.