3COM

Any device whose MAC address begins with 00:50:DA has a network interface built by 3COM. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:50:DA

Organization

3COM

Address

5400 BAYFRONT PLAZA SANTA CLARA CA US 95052

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.