What this means
The IEEE assigned the MA-L block 0000D9 to NIPPON TELEGRAPH & TELEPHONE. 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 00:00:D9, it is NIPPON TELEGRAPH & TELEPHONE hardware.
Frequently Asked Questions
Who owns MAC prefix 0000D9?
0000D9 is registered to NIPPON TELEGRAPH & TELEPHONE 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. NIPPON TELEGRAPH & TELEPHONE's block covers 16,777,216 addresses.
What devices use 0000D9?
Any network device with a MAC address starting 00:00:D9 was manufactured by or for NIPPON TELEGRAPH & TELEPHONE.