macadress

ABB Oy / Medium Voltage Products

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:21:C1:00:00:00 /24
Vendor addressPO Box 699 Vaasa FI FI-65101
Country🇫🇮  Finland
RegisteredJun 18, 2008
Block range00:21:C1:00:00:00– 00:21:C1:FF:FF:FF
Address capacity16,777,216
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 →

Ownership timeline

  1. Jun 18, 2008 – Mar 15, 2013 ABB Oy / Distribution Automation name changed
  2. Mar 15, 2013 – present ABB Oy / Medium Voltage Products

Example addresses in this block

00:21:C1:00:00:00 00:21:C1:7F:FF:FF 00:21:C1:FF:FF:FF

Where this block sits

Previous 00:21:C0:00:00:00 /24 Mobile Appliance, Inc. Next 00:21:C2:00:00:00 /24 GL Communications Inc

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

ABB Oy / Medium Voltage Products holds 1 registered blocks in the IEEE registry, ranking #3,738 of 33,421 organizations by block count.