macadress

Active Silicon Ltd

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:05:91:00:00:00 /24
Vendor addressPinewood Mews Iver GB SL0 0NA
Country🇬🇧  United Kingdom
RegisteredApr 17, 2001
Block range00:05:91:00:00:00– 00:05:91: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 17, 2001 – Jan 30, 2013 Active Silicon Ltd. name changedaddress changed
  2. Jan 30, 2013 – Jan 31, 2013 Active Silicon Ltd name changedaddress changed
  3. Jan 31, 2013 – Feb 14, 2013 Active Silicon Ltd. name changedaddress changed
  4. Feb 14, 2013 – present Active Silicon Ltd

Example addresses in this block

00:05:91:00:00:00 00:05:91:7F:FF:FF 00:05:91:FF:FF:FF

Where this block sits

Previous 00:05:90:00:00:00 /24 Swissvoice Ltd. Next 00:05:92:00:00:00 /24 Pultek Corp.

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

Active Silicon Ltd holds 1 registered blocks in the IEEE registry, ranking #3,996 of 33,421 organizations by block count.