Testop

Any device whose MAC address begins with 04:65:65 has a network interface built by Testop. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

04:65:65

Organization

Testop

Address

808, Hanshin IT tower, 272 digital-ro Guro-gu Seoul KR KS013

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.