MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix88:5F:E8:20:00:00 /28
Vendor addressCirconvallazione Sud, 15 Mantova IT 46100
Country🇮🇹 Italy
RegisteredDec 17, 2017
Block range88:5F:E8:20:00:00– 88:5F:E8:2F: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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88:5F:E8:10:00:00 /28
Apoidea Technology Co., Ltd.
Next
88:5F:E8:30:00:00 /28
Sonnet Labs Inc.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Opto Engineering holds 1 registered blocks in the IEEE registry, ranking #22,208 of 33,427 organizations by block count.