Norden Communication UK Ltd. (44:03:77:50:00:00 /28)

Norden Communication UK Ltd. 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.

Prefix44:03:77:50:00:00 /28

Vendor addressUnit-13, Baker Close, Oakwood Business Park Clacton-On-Sea Essex GB CO15 4BD

Block range44:03:77:50:00:00– 44:03:77:5F: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

44:03:77:50:00:00 44:03:77:57:FF:FF 44:03:77:5F:FF:FF