macadress

Cisco Systems, Inc

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:05:73:00:00:00 /24
Vendor address80 West Tasman Drive San Jose CA US 94568
Country🇺🇸  United States
RegisteredApr 17, 2001
Block range00:05:73:00:00:00– 00:05:73: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 – Sep 1, 2015 Cisco Systems, Inc. name changedaddress changed
  2. Sep 1, 2015 – present Cisco Systems, Inc

Example addresses in this block

00:05:73:00:00:00 00:05:73:7F:FF:FF 00:05:73:FF:FF:FF

Where this block sits

Previous 00:05:72:00:00:00 /24 Deonet Co., Ltd. Next 00:05:74:00:00:00 /24 Cisco Systems, Inc

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

Cisco Systems, Inc holds 1,258 registered blocks in the IEEE registry, ranking #3 of 33,421 organizations by block count.

Other blocks registered to Cisco Systems, Inc

00:00:0C:00:00:00 /24 MA-L 00:01:42:00:00:00 /24 MA-L 00:01:43:00:00:00 /24 MA-L 00:01:63:00:00:00 /24 MA-L 00:01:64:00:00:00 /24 MA-L 00:01:96:00:00:00 /24 MA-L 00:01:97:00:00:00 /24 MA-L 00:01:C7:00:00:00 /24 MA-L 00:01:C9:00:00:00 /24 MA-L 00:02:16:00:00:00 /24 MA-L 00:02:17:00:00:00 /24 MA-L 00:02:3D:00:00:00 /24 MA-L