Shanghai Rui Rui Communication Technology Co.Ltd.

Any device whose MAC address begins with A4:9F:89 has a network interface built by Shanghai Rui Rui Communication Technology 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

A4:9F:89

Organization

Shanghai Rui Rui Communication Technology Co.Ltd.

Address

Room 1130,Building No.1 ShangHai CN 201199

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.