Shanghai Joindata Technology Co.,Ltd.

Any device whose MAC address begins with A4:E6:B1 has a network interface built by Shanghai Joindata 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:E6:B1

Organization

Shanghai Joindata Technology Co.,Ltd.

Address

26F,Building1,No428,South Yanggao Road,Pudong District Shanghai Shanghai CN 200127

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.