Port Of London Authority

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.

Prefix4C:81:BE:80:00:00 /28

Vendor addressRoyal Pier Road Gravesend Kent GB DA12 2BG

Block range4C:81:BE:80:00:00– 4C:81:BE:8F: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

4C:81:BE:80:00:00 4C:81:BE:87:FF:FF 4C:81:BE:8F:FF:FF

Where this block sits

Previous 4C:81:BE:70:00:00 /28 Renson NV Next 4C:81:BE:90:00:00 /28 Shenzhen Jooan Technology Co., Ltd

The nearest registered blocks of the same size on either side of this one in IEEE's address space.

Port Of London Authority holds 1 registered blocks in the IEEE registry, ranking #23,255 of 33,427 organizations by block count.