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:D1:80:00:00 /28
Vendor address14000 Route 993 Trafford PA US 15085
Country🇺🇸 United States
RegisteredOct 16, 2015
Block range1C:21:D1:80:00:00– 1C:21:D1:8F: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 →
Ownership timeline
- Oct 16, 2015 – Mar 30, 2023 Reliatronics Inc. name changedaddress changed
- Mar 30, 2023 – present Cleaveland/Price, Inc.
Example addresses in this block
Where this block sits
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1C:21:D1:70:00:00 /28
Soundtrack Your Brand Sweden AB
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1C:21:D1:90:00:00 /28
Dynojet Research
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Cleaveland/Price, Inc. holds 2 registered blocks in the IEEE registry, ranking #1,744 of 33,427 organizations by block count.
Other blocks registered to Cleaveland/Price, Inc.