MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix44:03:77:10:00:00 /28
Vendor address286 Madison Ave, 8th floor New York NY US 10017
Country🇺🇸 United States
RegisteredAug 17, 2019
Block range44:03:77:10:00:00– 44:03:77:1F: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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44:03:77:00:00:00 /28
Musashi Seimitsu Industry Co.,Ltd
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44:03:77:20:00:00 /28
Exsom Computers LLC
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Atari, Inc. holds 1 registered blocks in the IEEE registry, ranking #5,729 of 33,421 organizations by block count.