Active Research Limited (F8:C9:D6:40:00:00 /28)

Active Research Limited MA-M

MA-M: a /28 block, one IEEE assigns within a larger OUI when a full /24 isn't needed, covering 1,048,576 addresses.

PrefixF8:C9:D6:40:00:00 /28

Vendor address21 Harwell Road Poole Dorset GB BH17 0GE

Block rangeF8:C9:D6:40:00:00– F8:C9:D6:4F: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

F8:C9:D6:40:00:00 F8:C9:D6:47:FF:FF F8:C9:D6:4F:FF:FF

Other blocks registered to Active Research Limited

70:B3:D5:6A:00:00 /36 MA-S 8C:1F:64:0C:00:00 /36 MA-S 8C:1F:64:5C:50:00 /36 MA-S