Which company owns MAC address prefix DC:58:BC?

MAC address prefix DC:58:BC is registered to Thomas-Krenn.AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:58:BC has a network interface built by Thomas-Krenn.AG.

What is the OUI DC:58:BC?

DC:58:BC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Thomas-Krenn.AG. It covers every address from DC:58:BC:00:00:00 to DC:58:BC:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-58-BC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:58:BC:00:00:00 that is DC:58:BC — 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 Thomas-Krenn.AG located?

Thomas-Krenn.AG is listed at Speltenbach-Steinaecker 1 Freyung DE 94078 in the IEEE OUI registry entry for DC:58:BC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Thomas-Krenn.AG

MAC address prefix DC:58:BC is registered to Thomas-Krenn.AG in the IEEE OUI registry. Any device whose MAC address begins with DC:58:BC has a network interface built by Thomas-Krenn.AG. 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:58:BC:00:00:00 to DC:58:BC:FF:FF:FF.

OUI prefix: DC:58:BC
Hyphen form: DC-58-BC
MAC range: DC:58:BC:00:00:00 – DC:58:BC:FF:FF:FF
Addresses in block: 16,777,216
Organization: Thomas-Krenn.AG
Address: Speltenbach-Steinaecker 1 Freyung DE 94078
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.

2018-12-21Assigned to "Thomas-Krenn.AG"
archived source →
2026-07-17Assigned to "Thomas-Krenn.AG"

Nearby in the registry

The prefixes assigned immediately before and after DC:58:BC:

FAQ

Which company owns MAC address prefix DC:58:BC?: MAC address prefix DC:58:BC is registered to Thomas-Krenn.AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:58:BC has a network interface built by Thomas-Krenn.AG.
What is the OUI DC:58:BC?: DC:58:BC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Thomas-Krenn.AG. It covers every address from DC:58:BC:00:00:00 to DC:58:BC:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-58-BC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:58:BC:00:00:00 that is DC:58:BC — 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 Thomas-Krenn.AG located?: Thomas-Krenn.AG is listed at Speltenbach-Steinaecker 1 Freyung DE 94078 in the IEEE OUI registry entry for DC:58:BC. This is the address the organization registered with the IEEE, which may differ from its current operating address.