GZT Telkom-Telmor sp. z o.o.

Any device whose MAC address begins with 00:25:0D has a network interface built by GZT Telkom-Telmor sp. z o.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

00:25:0D

Organization

GZT Telkom-Telmor sp. z o.o.

Address

Mickiewicza 5/7 Gdansk pomorskie PL 80-425

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.