MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixD4:7C:44:30:00:00 /28
Vendor address9F, Ebina Prime Tower, 9-50, Chuo 2 Chome Ebina-City Kanagawa JP 243-0432
Country🇯🇵 Japan
RegisteredMar 18, 2018
Block rangeD4:7C:44:30:00:00– D4:7C:44:3F: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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D4:7C:44:20:00:00 /28
YunDing Network Technology (Beijing) Co., Ltd
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D4:7C:44:40:00:00 /28
Sammi Onformation Systems
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
OMRON SENTECH CO., LTD. holds 1 registered blocks in the IEEE registry, ranking #21,992 of 33,427 organizations by block count.