MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixC0:D3:91:90:00:00 /28
Vendor addressElandsgracht 73 Amsterdam NL 1016 TR
Country🇹🇷 Turkey
RegisteredMay 22, 2016
Block rangeC0:D3:91:90:00:00– C0:D3:91:9F: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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C0:D3:91:80:00:00 /28
XENA SECURITY LIMITED
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C0:D3:91:A0:00:00 /28
Alpha Audiotronics, Inc.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
xxter bv holds 1 registered blocks in the IEEE registry, ranking #32,838 of 33,421 organizations by block count.