2C - Trifonov & Co

Any device whose MAC address begins with 28:F3:58 has a network interface built by 2C - Trifonov & Co. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

28:F3:58

Organization

2C - Trifonov & Co

Address

133, Tsarigradsko Shose Blvd, BIZ IZOT, Sofia BG 1784

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.