avinfo

Any device whose MAC address begins with 00:19:91 has a network interface built by avinfo. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:19:91

Organization

avinfo

Address

Jiahuiyuan 703,Huaao Center,31# Zizhuyuan Road, Beijing CN 100089

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.