M Seven System Ltd.

Any device whose MAC address begins with B8:D4:9D has a network interface built by M Seven System Ltd.. 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:D4:9D

Organization

M Seven System Ltd.

Address

24F, Trust Tower Bldg, 275-7, Yangjae2-Dong, Seocho-Gu Seoul KR 137-739

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.