ALTOS C&C

Any device whose MAC address begins with 00:30:81 has a network interface built by ALTOS C&C. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:30:81

Organization

ALTOS C&C

Address

150-010 RM. 1012, 44-1 KR KOREA

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.