Guangzhou Skytone Transmission Technology Com. Ltd.

Any device whose MAC address begins with 00:21:4D has a network interface built by Guangzhou Skytone Transmission Technology Com. 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

00:21:4D

Organization

Guangzhou Skytone Transmission Technology Com. Ltd.

Address

3/F West, Block 4, Huangzhou Guangzhou Guangdong CN 510660

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.