macadress

Kentrox, LLC

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:20:5B:00:00:00 /24
Vendor address20010 NW Tanasbourne Dr. Hillsboro OR US 97124
Country🇺🇸  United States
RegisteredApr 22, 1998
Block range00:20:5B:00:00:00– 00:20:5B: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 – Feb 12, 2004 SKYLINE TECHNOLOGY name changedaddress changed
  2. Feb 12, 2004 – present Kentrox, LLC

Example addresses in this block

00:20:5B:00:00:00 00:20:5B:7F:FF:FF 00:20:5B:FF:FF:FF

Where this block sits

Previous 00:20:5A:00:00:00 /24 COMPUTER IDENTICS Next 00:20:5C:00:00:00 /24 InterNet Systems of Florida, Inc.

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

Kentrox, LLC holds 1 registered blocks in the IEEE registry, ranking #17,587 of 33,427 organizations by block count.