MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix58:AD:08:20:00:00 /28
Vendor addressNo.8 Xihuanzhong RD,BDA Beijing Beijing CN 100176
Country🇨🇳 China
RegisteredDec 9, 2025
Block range58:AD:08:20:00:00– 58:AD:08:2F: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
58:AD:08:10:00:00 /28
AINOS INC. TAIWAN BRANCH
Next
58:AD:08:30:00:00 /28
Fujian Ruihe Technology Co., Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Beijing ShiYan Technology Co., Ltd holds 1 registered blocks in the IEEE registry, ranking #6,698 of 33,427 organizations by block count.