Handreamnet

Any device whose MAC address begins with B8:91:C9 has a network interface built by Handreamnet. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

B8:91:C9

Organization

Handreamnet

Address

#1203 Ace High-end Tower II, 61, Digital-ro 26-gil, Guro-Gu Seoul KR 08389

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.