MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix34:B5:F3:B0:00:00 /28
Vendor address13th Floor, Mitsubishi Building, 2-5-2 Marunouchi Chiyoda-ku Tokyo JP 100-0005
Country🇯🇵 Japan
RegisteredJul 11, 2025
Block range34:B5:F3:B0:00:00– 34:B5:F3:BF:FF:FF
Address capacity1,048,576
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
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34:B5:F3:A0:00:00 /28
Bethlabs(Tianjin)Technology Co.,Ltd.
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34:B5:F3:C0:00:00 /28
Shenzhen Mifasuolla Smart Co.,Ltd
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Aeterlink Corp. holds 1 registered blocks in the IEEE registry, ranking #4,329 of 33,421 organizations by block count.