MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixD4:61:37:70:00:00 /28
Vendor address6 / F, building 1, zone 3 Beijing Hanwei International Plaza, South Fourth Ring West Road, Fengtai District CN 100070
Country🇨🇳 China
RegisteredSep 1, 2022
Block rangeD4:61:37:70:00:00– D4:61:37:7F: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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D4:61:37:60:00:00 /28
Securus CCTV India
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D4:61:37:80:00:00 /28
Beijing Digital China Yunke Technology Limited
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Beijing Shudun Information Technology Co., Ltd holds 1 registered blocks in the IEEE registry, ranking #6,699 of 33,427 organizations by block count.