macadress

Siemens Switzerland Ltd., I B T HVP

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:A0:03:00:00:00 /24
Vendor addressBuilding Technologies Division, International Headquarters Zug CH 6301
Country🇨🇭  Switzerland
RegisteredApr 22, 1998
Block range00:A0:03:00:00:00– 00:A0:03: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. Apr 22, 1998 – Jun 23, 2009 STAEFA CONTROL SYSTEM name changedaddress changed
  2. Jun 23, 2009 – present Siemens Switzerland Ltd., I B T HVP

Example addresses in this block

00:A0:03:00:00:00 00:A0:03:7F:FF:FF 00:A0:03:FF:FF:FF

Where this block sits

Previous 00:A0:02:00:00:00 /24 LEEDS & NORTHRUP AUSTRALIA PTY LTD Next 00:A0:04:00:00:00 /24 NETPOWER, INC.

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

Siemens Switzerland Ltd., I B T HVP holds 1 registered blocks in the IEEE registry, ranking #27,322 of 33,427 organizations by block count.