What this means
The IEEE assigned the MA-L block 00404F to SPACE & NAVAL WARFARE SYSTEMS. 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 00:40:4F, it is SPACE & NAVAL WARFARE SYSTEMS hardware.
Frequently Asked Questions
Who owns MAC prefix 00404F?
00404F is registered to SPACE & NAVAL WARFARE SYSTEMS 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. SPACE & NAVAL WARFARE SYSTEMS's block covers 16,777,216 addresses.
What devices use 00404F?
Any network device with a MAC address starting 00:40:4F was manufactured by or for SPACE & NAVAL WARFARE SYSTEMS.