macadress

I'M SPA

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix20:91:D9:00:00:00 /24
Vendor addressVIA BIRON 102/3 MONTEVIALE VICENZA IT 36050
Country🇮🇹  Italy
RegisteredAug 14, 2012
Block range20:91:D9:00:00:00– 20:91:D9: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. Aug 14, 2012 – Nov 29, 2012 I'M SPA name changed
  2. Nov 29, 2012 – Jan 31, 2013 I'M SPA name changed
  3. Jan 31, 2013 – Feb 14, 2013 I'M SPA name changed
  4. Feb 14, 2013 – present I'M SPA

Example addresses in this block

20:91:D9:00:00:00 20:91:D9:7F:FF:FF 20:91:D9:FF:FF:FF

Where this block sits

Next 20:91:DF:00:00:00 /24 Apple, Inc.

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

I'M SPA holds 1 registered blocks in the IEEE registry, ranking #15,412 of 33,427 organizations by block count.