What this means
The IEEE assigned the MA-L block D440D0 to OCOSMOS Co., LTD. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting D4:40:D0, it is OCOSMOS Co., LTD hardware.
Frequently Asked Questions
Who owns MAC prefix D440D0?
D440D0 is registered to OCOSMOS Co., LTD in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. OCOSMOS Co., LTD's block covers 16,777,216 addresses.
What devices use D440D0?
Any network device with a MAC address starting D4:40:D0 was manufactured by or for OCOSMOS Co., LTD.