macadress

Cisco Systems, Inc

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:03:A0:00:00:00 /24
Vendor address80 West Tasman Drive San Jose CA US 94568
Country🇺🇸  United States
RegisteredNov 9, 2000
Block range00:03:A0:00:00:00– 00:03:A0: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 – Sep 1, 2015 Cisco Systems, Inc. name changedaddress changed
  2. Sep 1, 2015 – present Cisco Systems, Inc

Example addresses in this block

00:03:A0:00:00:00 00:03:A0:7F:FF:FF 00:03:A0:FF:FF:FF

Where this block sits

Previous 00:03:9F:00:00:00 /24 Cisco Systems, Inc Next 00:03:A1:00:00:00 /24 HIPER Information & Communication, 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