MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix30:EF:D1:00:00:00 /24
Vendor address5F,Building No.6, Keji Middle 2 Road High-Tech Industrial Park, Shen Zhen Guangdong CN 518057
Country🇨🇳 China
RegisteredJan 15, 2010
Block range30:EF:D1:00:00:00– 30:EF:D1:FF:FF:FF
Address capacity16,777,216
AdministrationUniversally administered: its prefix comes from a block registered through the IEEE Registration Authority
TransmissionUnicast: addressed to a single device
SourceIEEE Registration Authority
Address capacity is the size of this registered block, not a count of devices actually manufactured or online. Registration identifies the organization holding the block, not a specific device model or unit.
Curious how a prefix like this turns into a full address? See how MAC addresses are structured →
Example addresses in this block
Where this block sits
ALSTOM Strongwish (Shenzhen) Co., Ltd holds 2 registered blocks in the IEEE registry, ranking #1,491 of 33,421 organizations by block count.