MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
PrefixB4:FB:E3:00:00:00 /24
Vendor addressB808, Tsinghua Tongfang Hi-Tech Plaza, Haidian Beijing Beijing CN 100083
Country🇨🇳 China
RegisteredJul 26, 2020
Block rangeB4:FB:E3:00:00:00– B4:FB:E3: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 →
Ownership timeline
- Jul 26, 2020 – Jun 16, 2026 AltoBeam (China) Inc. name changed
- Jun 16, 2026 – present AltoBeam Inc.
Example addresses in this block
Where this block sits
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
AltoBeam Inc. holds 57 registered blocks in the IEEE registry, ranking #63 of 33,421 organizations by block count.
Other blocks registered to AltoBeam Inc.
08:76:83:00:00:00 /24
MA-L
20:98:ED:00:00:00 /24
MA-L
2C:CC:7A:00:00:00 /24
MA-L
2C:D8:DE:00:00:00 /24
MA-L
30:BE:29:00:00:00 /24
MA-L
34:98:7C:00:00:00 /24
MA-L
38:54:F5:00:00:00 /24
MA-L
38:77:07:00:00:00 /24
MA-L
38:BE:AB:00:00:00 /24
MA-L
44:29:1E:00:00:00 /24
MA-L
44:72:AC:00:00:00 /24
MA-L
48:A4:FD:00:00:00 /24
MA-L