CAYMAN SYSTEMS INC.

Any device whose MAC address begins with 00:00:89 has a network interface built by CAYMAN SYSTEMS INC.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:00:89

Organization

CAYMAN SYSTEMS INC.

Address

26 LANSDOWNE STREET CAMBRIDGE MA US 02139

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.