MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
PrefixD4:20:00:D0:00:00 /28
Vendor address4321 W Sam Houston Pkwy N Ste 120 Houston TX US 77043
Country🇺🇸 United States
RegisteredJul 6, 2022
Block rangeD4:20:00:D0:00:00– D4:20:00:DF: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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D4:20:00:C0:00:00 /28
Gentec Systems Co.
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D4:20:00:E0:00:00 /28
RPUSI Communication Technology Co.,Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
ZUUM holds 2 registered blocks in the IEEE registry, ranking #3,499 of 33,427 organizations by block count.
Other blocks registered to ZUUM