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:20:00:00 /28
Vendor addressRoom 110-400(central office) , building 18, Creative Valley, 1889 Huandao East road, Hengqin New District, Zhuhai GuangDong CN 519000
Country🇨🇳 China
RegisteredJun 16, 2020
Block range28:B7:7C:20:00:00– 28:B7:7C:2F: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
Previous
28:B7:7C:10:00:00 /28
SolarEdge Technologies
Next
28:B7:7C:30:00:00 /28
Beijing Kitten&Puppy Technology Co.,Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Zhuhai RongBang Electronic Technology Co., Ltd. holds 1 registered blocks in the IEEE registry, ranking #33,300 of 33,421 organizations by block count.