MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixB4:4D:43:40:00:00 /28
Vendor addressNOW Building, Thames Valley Park Drive, Reading, Berkshire, RG6 1RB Reading Berkshire GB RG6 1RB
Country🇬🇧 United Kingdom
RegisteredMar 3, 2023
Block rangeB4:4D:43:40:00:00– B4:4D:43:4F: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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B4:4D:43:30:00:00 /28
ETSME Technologies C0., Ltd.
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B4:4D:43:50:00:00 /28
halstrup-walcher GmbH
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
ALL.SPACE Networks Ltd holds 1 registered blocks in the IEEE registry, ranking #4,723 of 33,421 organizations by block count.