The "CF" series MAC addresses | FAQ | MAC Address Vendor Lookup
Frequently asked questions

The "CF" series MAC addresses

The OUIs prefixed "CF" (CF:00:00 to CF:FF:FF) are reserved by IANA for use in the Point-to-Point Protocol (PPP) or when vendors don't need an IEEE-assigned OUI.

These OUIs are both multicast and locally administered at the same time.

Summary

Range or Prefix Application
CF:00:00:00:00:00 - CF:00:00:FF:FF:FF Reserved
CF:00:00:00:00:00 Used for Ethernet loopback tests

References

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