macadress

Microsoft Corporation

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:03:FF:00:00:00 /24
Vendor address1 Microsoft Way Redmond WA US 98052
Country🇺🇸  United States
RegisteredNov 9, 2000
Block range00:03:FF:00:00:00– 00:03:FF: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. Nov 9, 2000 – Apr 3, 2004 Connectix name changedaddress changed
  2. Apr 3, 2004 – present Microsoft Corporation

Example addresses in this block

00:03:FF:00:00:00 00:03:FF:7F:FF:FF 00:03:FF:FF:FF:FF

Where this block sits

Previous 00:03:FE:00:00:00 /24 Cisco Systems, Inc Next 00:04:00:00:00:00 /24 LEXMARK INTERNATIONAL, INC.

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

Microsoft Corporation holds 106 registered blocks in the IEEE registry, ranking #32 of 33,421 organizations by block count.

Other blocks registered to Microsoft Corporation

00:12:5A:00:00:00 /24 MA-L 00:15:5D:00:00:00 /24 MA-L 00:17:FA:00:00:00 /24 MA-L 00:1D:D8:00:00:00 /24 MA-L 00:22:48:00:00:00 /24 MA-L 00:25:AE:00:00:00 /24 MA-L 04:27:28:00:00:00 /24 MA-L 08:35:7D:00:00:00 /24 MA-L 0C:1B:7B:00:00:00 /24 MA-L 0C:35:26:00:00:00 /24 MA-L 0C:41:3E:00:00:00 /24 MA-L 0C:E7:25:00:00:00 /24 MA-L