MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix1C:21:D1:70:00:00 /28
Vendor addressBirger Jarlsgatan 43 Stockholm SE 11145
Country🇸🇪 Sweden
RegisteredOct 16, 2015
Block range1C:21:D1:70:00:00– 1C:21:D1:7F: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
1C:21:D1:60:00:00 /28
Wuhan TieChi Detection Technology Co., Ltd.
Next
1C:21:D1:80:00:00 /28
Cleaveland/Price, Inc.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Soundtrack Your Brand Sweden AB holds 1 registered blocks in the IEEE registry, ranking #28,069 of 33,427 organizations by block count.