NSGate

Any device whose MAC address begins with 00:1D:77 has a network interface built by NSGate. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:1D:77

Organization

NSGate

Address

Rm 1304, 39 Kirpichnaya Street Moscow RU 105187

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.