Which company owns MAC address prefix 78:D3:ED?

MAC address prefix 78:D3:ED is registered to NORMA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:D3:ED has a network interface built by NORMA.

What is the OUI 78:D3:ED?

78:D3:ED is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NORMA. It covers every address from 78:D3:ED:00:00:00 to 78:D3:ED:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-D3-ED.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:D3:ED:00:00:00 that is 78:D3:ED — 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 NORMA located?

NORMA is listed at Achasan-ro 7na-gil, Seongdong-Gu Seoul KR 04795 in the IEEE OUI registry entry for 78:D3:ED. This is the address the organization registered with the IEEE, which may differ from its current operating address.

NORMA

MAC address prefix 78:D3:ED is registered to NORMA in the IEEE OUI registry. Any device whose MAC address begins with 78:D3:ED has a network interface built by NORMA. 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 78:D3:ED:00:00:00 to 78:D3:ED:FF:FF:FF.

OUI prefix: 78:D3:ED
Hyphen form: 78-D3-ED
MAC range: 78:D3:ED:00:00:00 – 78:D3:ED:FF:FF:FF
Addresses in block: 16,777,216
Organization: NORMA
Address: Achasan-ro 7na-gil, Seongdong-Gu Seoul KR 04795
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "NORMA"

Nearby in the registry

The prefixes assigned immediately before and after 78:D3:ED:

FAQ

Which company owns MAC address prefix 78:D3:ED?: MAC address prefix 78:D3:ED is registered to NORMA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:D3:ED has a network interface built by NORMA.
What is the OUI 78:D3:ED?: 78:D3:ED is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NORMA. It covers every address from 78:D3:ED:00:00:00 to 78:D3:ED:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-D3-ED.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:D3:ED:00:00:00 that is 78:D3:ED — 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 NORMA located?: NORMA is listed at Achasan-ro 7na-gil, Seongdong-Gu Seoul KR 04795 in the IEEE OUI registry entry for 78:D3:ED. This is the address the organization registered with the IEEE, which may differ from its current operating address.