MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.
Prefix38:73:EA:40:00:00 /28
Vendor addressSt John's Innovation Centre, Cowley Road Cambridge Cambridgeshire GB CB40WS
Country🇬🇧 United Kingdom
RegisteredAug 20, 2017
Block range38:73:EA:40:00:00– 38:73:EA:4F: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
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Light Blue Optics Ltd. holds 1 registered blocks in the IEEE registry, ranking #18,478 of 33,427 organizations by block count.