MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
PrefixF4:B1:9C:00:00:00 /24
Vendor addressB808, Tsinghua Tongfang Hi-Tech Plaza, Haidian Beijing Beijing CN 100083
Country🇨🇳 China
RegisteredJun 4, 2021
Block rangeF4:B1:9C:00:00:00– F4:B1:9C: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
- Jun 4, 2021 – Jun 16, 2026 AltoBeam (China) Inc. name changed
- Jun 16, 2026 – present AltoBeam Inc.
Example addresses in this block
Where this block sits
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