Cisco Systems, Inc
Any device whose MAC address begins with 40:06:D5 has a network interface built by Cisco Systems, 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
- 40:06:D5
- Organization
- Cisco Systems, Inc
- Address
- 80 West Tasman Drive San Jose CA US 94568
- 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.