macadress

Shanghai Nohmi Secom Fire Protection Equipment Co.,Ltd.

MA-M
MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixA0:28:33:20:00:00 /28
Vendor addressNo.98,Lane 1971,(s)Lianhua Road,Minhang Area Shanghai Shanghai CN 201108
Country🇨🇳  China
RegisteredMay 27, 2018
Block rangeA0:28:33:20:00:00– A0:28:33:2F: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

A0:28:33:20:00:00 A0:28:33:27:FF:FF A0:28:33:2F:FF:FF

Where this block sits

Previous A0:28:33:10:00:00 /28 Ordercube GmbH Next A0:28:33:30:00:00 /28 SHANGHAI XUNTAI INFORMATION TECHNOLOGY CO.,LTD.

The nearest registered blocks of the same size on either side of this one in IEEE's address space.

Shanghai Nohmi Secom Fire Protection Equipment Co.,Ltd. holds 1 registered blocks in the IEEE registry, ranking #26,006 of 33,427 organizations by block count.