Which company owns MAC address prefix 20:1D:03?

MAC address prefix 20:1D:03 is registered to Elatec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:1D:03 has a network interface built by Elatec GmbH.

What is the OUI 20:1D:03?

20:1D:03 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Elatec GmbH. It covers every address from 20:1D:03:00:00:00 to 20:1D:03:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-1D-03.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:1D:03:00:00:00 that is 20:1D:03 — 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 Elatec GmbH located?

Elatec GmbH is listed at Lilienthalstr. 3 Puchheim Bayern DE 82178 in the IEEE OUI registry entry for 20:1D:03. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Elatec GmbH

MAC address prefix 20:1D:03 is registered to Elatec GmbH in the IEEE OUI registry. Any device whose MAC address begins with 20:1D:03 has a network interface built by Elatec GmbH. 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 20:1D:03:00:00:00 to 20:1D:03:FF:FF:FF.

OUI prefix: 20:1D:03
Hyphen form: 20-1D-03
MAC range: 20:1D:03:00:00:00 – 20:1D:03:FF:FF:FF
Addresses in block: 16,777,216
Organization: Elatec GmbH
Address: Lilienthalstr. 3 Puchheim Bayern DE 82178
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 "Elatec GmbH"
archived source →
2026-07-17Assigned to "Elatec GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 20:1D:03:

FAQ

Which company owns MAC address prefix 20:1D:03?: MAC address prefix 20:1D:03 is registered to Elatec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:1D:03 has a network interface built by Elatec GmbH.
What is the OUI 20:1D:03?: 20:1D:03 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Elatec GmbH. It covers every address from 20:1D:03:00:00:00 to 20:1D:03:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-1D-03.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:1D:03:00:00:00 that is 20:1D:03 — 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 Elatec GmbH located?: Elatec GmbH is listed at Lilienthalstr. 3 Puchheim Bayern DE 82178 in the IEEE OUI registry entry for 20:1D:03. This is the address the organization registered with the IEEE, which may differ from its current operating address.