Cloudflare, Inc.

Any device whose MAC address begins with 6C:45:C4 has a network interface built by Cloudflare, Inc.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

6C:45:C4

Organization

Cloudflare, Inc.

Address

101 Townsend Street San Francisco CA US 94107

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.