MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix18:45:B3:80:00:00 /28
Vendor addressTopband Industrial Park, Shiyan Town, Bao'anDistrict,Shenzhen Shenzhen CN 518000
Country🇨🇳 China
RegisteredOct 1, 2021
Block range18:45:B3:80:00:00– 18:45:B3:8F: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
18:45:B3:70:00:00 /28
Shenzhen Incar Technology Co., Ltd.
Next
18:45:B3:90:00:00 /28
Teko Telecom Srl
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
ShenZhen Topband Co.,Ltd holds 1 registered blocks in the IEEE registry, ranking #26,953 of 33,427 organizations by block count.