CZ.NIC, z.s.p.o.

Any device whose MAC address begins with D8:58:D7 has a network interface built by CZ.NIC, z.s.p.o.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

D8:58:D7

Organization

CZ.NIC, z.s.p.o.

Address

Americka 23 Prague CZ 12000

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.