macadress

Hottinger Brüel & Kjaer GmbH

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:09:E5:00:00:00 /24
Vendor addressIm Tiefen See 45 Darmstadt DE D-64293
Country🇩🇪  Germany
RegisteredJun 5, 2002
Block range00:09:E5:00:00:00– 00:09:E5: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 5, 2002 – Nov 11, 2021 Hottinger Baldwin Messtechnik GmbH name changedaddress changedcountry changed
  2. Nov 11, 2021 – present Hottinger Brüel & Kjaer GmbH

Example addresses in this block

00:09:E5:00:00:00 00:09:E5:7F:FF:FF 00:09:E5:FF:FF:FF

Where this block sits

Previous 00:09:E4:00:00:00 /24 K Tech Infosystem Inc. Next 00:09:E6:00:00:00 /24 Cyber Switching Inc.

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

Hottinger Brüel & Kjaer GmbH holds 1 registered blocks in the IEEE registry, ranking #15,138 of 33,421 organizations by block count.