SeaMicro Inc.

Any device whose MAC address begins with 00:21:53 has a network interface built by SeaMicro 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

00:21:53

Organization

SeaMicro Inc.

Address

3250 Jay Street Santa Clara CA US 95054

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.