Which company owns MAC address prefix 00:DD:01?

MAC address prefix 00:DD:01 is registered to UNGERMANN-BASS INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:DD:01 has a network interface built by UNGERMANN-BASS INC..

What is the OUI 00:DD:01?

00:DD:01 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to UNGERMANN-BASS INC.. It covers every address from 00:DD:01:00:00:00 to 00:DD:01:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-DD-01.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:DD:01:00:00:00 that is 00:DD:01 — 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 UNGERMANN-BASS INC. located?

UNGERMANN-BASS INC. is listed at 3900 FREEDOM CIRCLE SANTA CLARA CA US 95054 in the IEEE OUI registry entry for 00:DD:01. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does UNGERMANN-BASS INC. own?

UNGERMANN-BASS INC. holds 17 OUI prefixes in the IEEE registry, of which 00:DD:01 is one. A device made by UNGERMANN-BASS INC. could carry a MAC address from any of them.

UNGERMANN-BASS INC.

MAC address prefix 00:DD:01 is registered to UNGERMANN-BASS INC. in the IEEE OUI registry. Any device whose MAC address begins with 00:DD:01 has a network interface built by UNGERMANN-BASS INC.. 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 00:DD:01:00:00:00 to 00:DD:01:FF:FF:FF.

OUI prefix: 00:DD:01
Hyphen form: 00-DD-01
MAC range: 00:DD:01:00:00:00 – 00:DD:01:FF:FF:FF
Addresses in block: 16,777,216
Organization: UNGERMANN-BASS INC.
Address: 3900 FREEDOM CIRCLE SANTA CLARA CA US 95054
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.

Other prefixes from UNGERMANN-BASS INC.

UNGERMANN-BASS INC. holds 17 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "UNGERMANN-BASS INC."
archived source →
2026-07-17Assigned to "UNGERMANN-BASS INC."

Nearby in the registry

The prefixes assigned immediately before and after 00:DD:01:

FAQ

Which company owns MAC address prefix 00:DD:01?: MAC address prefix 00:DD:01 is registered to UNGERMANN-BASS INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:DD:01 has a network interface built by UNGERMANN-BASS INC..
What is the OUI 00:DD:01?: 00:DD:01 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to UNGERMANN-BASS INC.. It covers every address from 00:DD:01:00:00:00 to 00:DD:01:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-DD-01.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:DD:01:00:00:00 that is 00:DD:01 — 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 UNGERMANN-BASS INC. located?: UNGERMANN-BASS INC. is listed at 3900 FREEDOM CIRCLE SANTA CLARA CA US 95054 in the IEEE OUI registry entry for 00:DD:01. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does UNGERMANN-BASS INC. own?: UNGERMANN-BASS INC. holds 17 OUI prefixes in the IEEE registry, of which 00:DD:01 is one. A device made by UNGERMANN-BASS INC. could carry a MAC address from any of them.