IEEE Registration Authority - MAC Prefix 6433B5 (MA-L)

What this means

The IEEE assigned the MA-L block 6433B5 to IEEE Registration Authority. 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 64:33:B5, it is IEEE Registration Authority hardware.

Frequently Asked Questions

Who owns MAC prefix 6433B5?

6433B5 is registered to IEEE Registration Authority 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. IEEE Registration Authority's block covers 16,777,216 addresses.

What devices use 6433B5?

Any network device with a MAC address starting 64:33:B5 was manufactured by or for IEEE Registration Authority.

Other IEEE Registration Authority prefixes

IEEE Registration Authority holds 439 registered blocks in total.

OUI prefix	6433B5
Vendor	IEEE Registration Authority
Registry	MA-L (24-bit, large block)
Block size	16,777,216 addresses
Country	US
Other blocks by this vendor	439 total
Example MAC	64:33:B5:00:00:00