IEEE Registration Authority - MAC Prefix 303D51 (MA-L)

What this means

The IEEE assigned the MA-L block 303D51 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 30:3D:51, it is IEEE Registration Authority hardware.

Frequently Asked Questions

Who owns MAC prefix 303D51?

303D51 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 303D51?

Any network device with a MAC address starting 30:3D:51 was manufactured by or for IEEE Registration Authority.

Other IEEE Registration Authority prefixes

IEEE Registration Authority holds 439 registered blocks in total.

OUI prefix	303D51
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	30:3D:51:00:00:00