Which company owns MAC address prefix 9C:DB:07?

MAC address prefix 9C:DB:07 is registered to Yellowtec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:DB:07 has a network interface built by Yellowtec GmbH.

What is the OUI 9C:DB:07?

9C:DB:07 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yellowtec GmbH. It covers every address from 9C:DB:07:00:00:00 to 9C:DB:07:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-DB-07.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:DB:07:00:00:00 that is 9C:DB:07 — 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 Yellowtec GmbH located?

Yellowtec GmbH is listed at Heinrich-Hertz-Strasse 1-3 Monheim am Rhein NRW DE 40789 in the IEEE OUI registry entry for 9C:DB:07. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Yellowtec GmbH

MAC address prefix 9C:DB:07 is registered to Yellowtec GmbH in the IEEE OUI registry. Any device whose MAC address begins with 9C:DB:07 has a network interface built by Yellowtec 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 9C:DB:07:00:00:00 to 9C:DB:07:FF:FF:FF.

OUI prefix: 9C:DB:07
Hyphen form: 9C-DB-07
MAC range: 9C:DB:07:00:00:00 – 9C:DB:07:FF:FF:FF
Addresses in block: 16,777,216
Organization: Yellowtec GmbH
Address: Heinrich-Hertz-Strasse 1-3 Monheim am Rhein NRW DE 40789
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.

2018-12-21Assigned to "Thum+Mahr GmbH"
archived source →
2022-09-05Renamed from "Thum+Mahr GmbH" to "Yellowtec GmbH"
archived source →
2026-07-17Assigned to "Yellowtec GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 9C:DB:07:

FAQ

Which company owns MAC address prefix 9C:DB:07?: MAC address prefix 9C:DB:07 is registered to Yellowtec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:DB:07 has a network interface built by Yellowtec GmbH.
What is the OUI 9C:DB:07?: 9C:DB:07 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yellowtec GmbH. It covers every address from 9C:DB:07:00:00:00 to 9C:DB:07:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-DB-07.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:DB:07:00:00:00 that is 9C:DB:07 — 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 Yellowtec GmbH located?: Yellowtec GmbH is listed at Heinrich-Hertz-Strasse 1-3 Monheim am Rhein NRW DE 40789 in the IEEE OUI registry entry for 9C:DB:07. This is the address the organization registered with the IEEE, which may differ from its current operating address.