Arista Networks

Any device whose MAC address begins with 28:99:3A has a network interface built by Arista Networks. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

28:99:3A

Organization

Arista Networks

Address

5453 Great America Parkway 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.