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:A0:00:00 /28
Vendor addressRoom 514 The 5th Floor, No.175 Weizhan Road China (Shanghai) Plilot Free Trade Zone Shanghai CN 201306
Country🇨🇳 China
RegisteredJun 25, 2026
Block range50:19:11:A0:00:00– 50:19:11:AF: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
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50:19:11:90:00:00 /28
Rugged Logic, Inc.
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50:19:11:B0:00:00 /28
Sichuan Wanwu Zongheng Technology Co., Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Shanghai Sigen New Energy Technology Co., Ltd holds 4 registered blocks in the IEEE registry, ranking #822 of 33,421 organizations by block count.
Other blocks registered to Shanghai Sigen New Energy Technology Co., Ltd