Which company owns MAC address prefix 20:4C:6D?

MAC address prefix 20:4C:6D is registered to Hugo Brennenstuhl Gmbh & Co. KG. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:4C:6D has a network interface built by Hugo Brennenstuhl Gmbh & Co. KG..

What is the OUI 20:4C:6D?

20:4C:6D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hugo Brennenstuhl Gmbh & Co. KG.. It covers every address from 20:4C:6D:00:00:00 to 20:4C:6D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-4C-6D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:4C:6D:00:00:00 that is 20:4C:6D — 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 Hugo Brennenstuhl Gmbh & Co. KG. located?

Hugo Brennenstuhl Gmbh & Co. KG. is listed at Seestr. 1-3 Tuebingen Baden-Wuerttemberg DE 72074 in the IEEE OUI registry entry for 20:4C:6D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Hugo Brennenstuhl Gmbh & Co. KG.

MAC address prefix 20:4C:6D is registered to Hugo Brennenstuhl Gmbh & Co. KG. in the IEEE OUI registry. Any device whose MAC address begins with 20:4C:6D has a network interface built by Hugo Brennenstuhl Gmbh & Co. KG.. 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 20:4C:6D:00:00:00 to 20:4C:6D:FF:FF:FF.

OUI prefix: 20:4C:6D
Hyphen form: 20-4C-6D
MAC range: 20:4C:6D:00:00:00 – 20:4C:6D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Hugo Brennenstuhl Gmbh & Co. KG.
Address: Seestr. 1-3 Tuebingen Baden-Wuerttemberg DE 72074
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 "Hugo Brennenstuhl Gmbh & Co. KG."
archived source →
2026-07-17Assigned to "Hugo Brennenstuhl Gmbh & Co. KG."

Nearby in the registry

The prefixes assigned immediately before and after 20:4C:6D:

FAQ

Which company owns MAC address prefix 20:4C:6D?: MAC address prefix 20:4C:6D is registered to Hugo Brennenstuhl Gmbh & Co. KG. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:4C:6D has a network interface built by Hugo Brennenstuhl Gmbh & Co. KG..
What is the OUI 20:4C:6D?: 20:4C:6D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hugo Brennenstuhl Gmbh & Co. KG.. It covers every address from 20:4C:6D:00:00:00 to 20:4C:6D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-4C-6D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:4C:6D:00:00:00 that is 20:4C:6D — 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 Hugo Brennenstuhl Gmbh & Co. KG. located?: Hugo Brennenstuhl Gmbh & Co. KG. is listed at Seestr. 1-3 Tuebingen Baden-Wuerttemberg DE 72074 in the IEEE OUI registry entry for 20:4C:6D. This is the address the organization registered with the IEEE, which may differ from its current operating address.