Which company owns MAC address prefix 8C:DF:9D?

MAC address prefix 8C:DF:9D is registered to NEC Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 8C:DF:9D has a network interface built by NEC Corporation.

What is the OUI 8C:DF:9D?

8C:DF:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NEC Corporation. It covers every address from 8C:DF:9D:00:00:00 to 8C:DF:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 8C-DF-9D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 8C:DF:9D:00:00:00 that is 8C:DF:9D — 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 NEC Corporation located?

NEC Corporation is listed at 7-1, Shiba 5-chome, Tokyo Tokyo JP 108-8001 in the IEEE OUI registry entry for 8C:DF:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does NEC Corporation own?

NEC Corporation holds 9 OUI prefixes in the IEEE registry, of which 8C:DF:9D is one. A device made by NEC Corporation could carry a MAC address from any of them.

NEC Corporation

MAC address prefix 8C:DF:9D is registered to NEC Corporation in the IEEE OUI registry. Any device whose MAC address begins with 8C:DF:9D has a network interface built by NEC Corporation. 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 8C:DF:9D:00:00:00 to 8C:DF:9D:FF:FF:FF.

OUI prefix: 8C:DF:9D
Hyphen form: 8C-DF-9D
MAC range: 8C:DF:9D:00:00:00 – 8C:DF:9D:FF:FF:FF
Addresses in block: 16,777,216
Organization: NEC Corporation
Address: 7-1, Shiba 5-chome, Tokyo Tokyo JP 108-8001
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 NEC Corporation

NEC Corporation holds 9 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 "NEC Corporation"
archived source →
2026-07-17Assigned to "NEC Corporation"

Nearby in the registry

The prefixes assigned immediately before and after 8C:DF:9D:

FAQ

Which company owns MAC address prefix 8C:DF:9D?: MAC address prefix 8C:DF:9D is registered to NEC Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 8C:DF:9D has a network interface built by NEC Corporation.
What is the OUI 8C:DF:9D?: 8C:DF:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NEC Corporation. It covers every address from 8C:DF:9D:00:00:00 to 8C:DF:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 8C-DF-9D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 8C:DF:9D:00:00:00 that is 8C:DF:9D — 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 NEC Corporation located?: NEC Corporation is listed at 7-1, Shiba 5-chome, Tokyo Tokyo JP 108-8001 in the IEEE OUI registry entry for 8C:DF:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does NEC Corporation own?: NEC Corporation holds 9 OUI prefixes in the IEEE registry, of which 8C:DF:9D is one. A device made by NEC Corporation could carry a MAC address from any of them.