NIPPON TELEGRAPH & TELEPHONE

Any device whose MAC address begins with 00:00:D9 has a network interface built by NIPPON TELEGRAPH & TELEPHONE. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:00:D9

Organization

NIPPON TELEGRAPH & TELEPHONE

Address

CORPORATION (NTT) TOKYO 100-8116 JP

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.