WISI

Any device whose MAC address begins with 00:03:98 has a network interface built by WISI. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:03:98

Organization

WISI

Address

Wilhelm-Sihn-Str. 5-7 D-75223 Niefern-Oeschelbronn DE

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.