MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix50:19:11:B0:00:00 /28
Vendor addressNo. 1, 7th Floor, Building 12, No. 1388, Middle Tianfu Avenue, Chengdu High-tech Zone, China (Sichuan) Pilot Free Trade Zone Chengdu Sichuan CN 610041
Country🇨🇳 China
RegisteredJun 25, 2026
Block range50:19:11:B0:00:00– 50:19:11:BF: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
50:19:11:A0:00:00 /28
Shanghai Sigen New Energy Technology Co., Ltd
Next
50:19:11:C0:00:00 /28
J-Tech Digital, Inc
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Sichuan Wanwu Zongheng Technology Co., Ltd. holds 1 registered blocks in the IEEE registry, ranking #27,260 of 33,421 organizations by block count.