Which company owns MAC address prefix 28:A6:AC?

MAC address prefix 28:A6:AC is registered to seca gmbh & co. kg in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:A6:AC has a network interface built by seca gmbh & co. kg.

What is the OUI 28:A6:AC?

28:A6:AC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to seca gmbh & co. kg. It covers every address from 28:A6:AC:00:00:00 to 28:A6:AC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-A6-AC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:A6:AC:00:00:00 that is 28:A6:AC — 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 seca gmbh & co. kg located?

seca gmbh & co. kg is listed at Hammer Steindamm 3-25 Hamburg Germany DE 22089 in the IEEE OUI registry entry for 28:A6:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

seca gmbh & co. kg

MAC address prefix 28:A6:AC is registered to seca gmbh & co. kg in the IEEE OUI registry. Any device whose MAC address begins with 28:A6:AC has a network interface built by seca 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 28:A6:AC:00:00:00 to 28:A6:AC:FF:FF:FF.

OUI prefix: 28:A6:AC
Hyphen form: 28-A6-AC
MAC range: 28:A6:AC:00:00:00 – 28:A6:AC:FF:FF:FF
Addresses in block: 16,777,216
Organization: seca gmbh & co. kg
Address: Hammer Steindamm 3-25 Hamburg Germany DE 22089
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.

2017-09-08Assigned to "seca gmbh & co. kg"
archived source →
2026-07-17Assigned to "seca gmbh & co. kg"

Nearby in the registry

The prefixes assigned immediately before and after 28:A6:AC:

FAQ

Which company owns MAC address prefix 28:A6:AC?: MAC address prefix 28:A6:AC is registered to seca gmbh & co. kg in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:A6:AC has a network interface built by seca gmbh & co. kg.
What is the OUI 28:A6:AC?: 28:A6:AC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to seca gmbh & co. kg. It covers every address from 28:A6:AC:00:00:00 to 28:A6:AC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-A6-AC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:A6:AC:00:00:00 that is 28:A6:AC — 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 seca gmbh & co. kg located?: seca gmbh & co. kg is listed at Hammer Steindamm 3-25 Hamburg Germany DE 22089 in the IEEE OUI registry entry for 28:A6:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.