Stonesoft Corporation

Any device whose MAC address begins with 58:7A:4D has a network interface built by Stonesoft Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

58:7A:4D

Organization

Stonesoft Corporation

Address

Italahdenkatu 22A Helsinki FI 00210

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.