12Sided Technology, LLC

Any device whose MAC address begins with A8:5E:E4 has a network interface built by 12Sided Technology, LLC. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

A8:5E:E4

Organization

12Sided Technology, LLC

Address

1 Penn Plaza, 36th Floor New York NY US 10119

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.