Alstom Strongwish (Shenzhen) Co., Ltd.

Any device whose MAC address begins with 30:EF:D1 has a network interface built by Alstom Strongwish (Shenzhen) Co., Ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

30:EF:D1

Organization

Alstom Strongwish (Shenzhen) Co., Ltd.

Address

5F,Building No.6, Keji Middle 2 Road High-Tech Industrial Park, Shen Zhen Guangdong CN 518057

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.