What this means
The IEEE assigned the MA-L block D4945A to COSMO 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 D4:94:5A, it is COSMO CO., LTD hardware.
Frequently Asked Questions
Who owns MAC prefix D4945A?
D4945A is registered to COSMO 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. COSMO CO., LTD's block covers 16,777,216 addresses.
What devices use D4945A?
Any network device with a MAC address starting D4:94:5A was manufactured by or for COSMO CO., LTD.