macadress

PSI Software SE,

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:05:DB:00:00:00 /24
Vendor addressOstring 6 Karlsruhe DE 76131
Country🇩🇪  Germany
RegisteredJun 4, 2001
Block range00:05:DB:00:00:00– 00:05:DB: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 4, 2001 – Dec 31, 2007 Nentec GmbH name changedaddress changed
  2. Dec 31, 2007 – Jun 12, 2010 NENTEC Netzwerktechnologie GmbH name changed
  3. Jun 12, 2010 – Dec 12, 2025 PSI Nentec GmbH name changedaddress changed
  4. Dec 12, 2025 – present PSI Software SE,

Example addresses in this block

00:05:DB:00:00:00 00:05:DB:7F:FF:FF 00:05:DB:FF:FF:FF

Where this block sits

Previous 00:05:DA:00:00:00 /24 Apex Automationstechnik Next 00:05:DC:00:00:00 /24 Cisco Systems, Inc

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

PSI Software SE, holds 1 registered blocks in the IEEE registry, ranking #23,661 of 33,421 organizations by block count.