DVR C&C Co., Ltd.

Any device whose MAC address begins with 84:57:87 has a network interface built by DVR C&C Co., 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

84:57:87

Organization

DVR C&C Co., Ltd.

Address

7F 720 Namkwang Centlex Bldg, Cheongcheon-dong, Bupyeong-gu Incheon KR 403-030

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.