Which company owns MAC address prefix 24:EA:40?

MAC address prefix 24:EA:40 is registered to Helmholz GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 24:EA:40 has a network interface built by Helmholz GmbH & Co. KG.

What is the OUI 24:EA:40?

24:EA:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Helmholz GmbH & Co. KG. It covers every address from 24:EA:40:00:00:00 to 24:EA:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written 24-EA-40.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 24:EA:40:00:00:00 that is 24:EA:40 — 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 Helmholz GmbH & Co. KG located?

Helmholz GmbH & Co. KG is listed at Hannberger Weg 2 Grossenseebach BAY DE 91091 in the IEEE OUI registry entry for 24:EA:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Helmholz GmbH & Co. KG

MAC address prefix 24:EA:40 is registered to Helmholz GmbH & Co. KG in the IEEE OUI registry. Any device whose MAC address begins with 24:EA:40 has a network interface built by Helmholz 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 24:EA:40:00:00:00 to 24:EA:40:FF:FF:FF.

OUI prefix: 24:EA:40
Hyphen form: 24-EA-40
MAC range: 24:EA:40:00:00:00 – 24:EA:40:FF:FF:FF
Addresses in block: 16,777,216
Organization: Helmholz GmbH & Co. KG
Address: Hannberger Weg 2 Grossenseebach BAY DE 91091
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 (3)

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 "Systeme Helmholz GmbH"
archived source →
2017-09-08Renamed from "Systeme Helmholz GmbH" to "Helmholz GmbH & Co. KG"
archived source →
2026-07-17Assigned to "Helmholz GmbH & Co. KG"

Nearby in the registry

The prefixes assigned immediately before and after 24:EA:40:

FAQ

Which company owns MAC address prefix 24:EA:40?: MAC address prefix 24:EA:40 is registered to Helmholz GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 24:EA:40 has a network interface built by Helmholz GmbH & Co. KG.
What is the OUI 24:EA:40?: 24:EA:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Helmholz GmbH & Co. KG. It covers every address from 24:EA:40:00:00:00 to 24:EA:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written 24-EA-40.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 24:EA:40:00:00:00 that is 24:EA:40 — 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 Helmholz GmbH & Co. KG located?: Helmholz GmbH & Co. KG is listed at Hannberger Weg 2 Grossenseebach BAY DE 91091 in the IEEE OUI registry entry for 24:EA:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.