CELESTICA INC.

Any device whose MAC address begins with B4:DB:91 has a network interface built by CELESTICA 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

B4:DB:91

Organization

CELESTICA INC.

Address

1900-5140 Yonge Street PO Box 42 Toronto Ontario CA M2N 6L7

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.