MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix28:B7:7C:30:00:00 /28
Vendor addressRoom Q-101? Floor 2?Q Area, Anningzhuang Back Street?Haidian District Beijing CN 100096
Country🇨🇳 China
RegisteredJun 18, 2020
Block range28:B7:7C:30:00:00– 28:B7:7C: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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28:B7:7C:20:00:00 /28
Zhuhai RongBang Electronic Technology Co., Ltd.
Next
28:B7:7C:40:00:00 /28
Annapurna labs
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Beijing Kitten&Puppy Technology Co.,Ltd. holds 1 registered blocks in the IEEE registry, ranking #6,614 of 33,421 organizations by block count.