ADVA Optical Networking Ltd.

Any device whose MAC address begins with 28:9A:F7 has a network interface built by ADVA Optical Networking Ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

28:9A:F7

Organization

ADVA Optical Networking Ltd.

Address

ADVAntage House York GB YO30 4RY

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.