MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix04:A1:6F:A0:00:00 /28
Vendor addressHalkali Merkez Mh. Dereboyu Cd, Caliskan Sk., 34303 Kucukcekmece/Istanbul Istanbul TR 34303
Country🇹🇷 Turkey
RegisteredFeb 19, 2025
Block range04:A1:6F:A0:00:00– 04:A1:6F: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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04:A1:6F:90:00:00 /28
Chongqing Jinmei Automotive Electronics co.,Ltd.
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04:A1:6F:B0:00:00 /28
Chroma-Q
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
UYAR GROUP holds 1 registered blocks in the IEEE registry, ranking #31,136 of 33,421 organizations by block count.