IBM Corp (00:18:B1:00:00:00 /24)

IBM Corp MA-L

MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.

Prefix00:18:B1:00:00:00 /24

Vendor address2051 Mission College Blvd Santa Clara CA US 95054

Block range00:18:B1:00:00:00– 00:18:B1: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 →

Example addresses in this block

00:18:B1:00:00:00 00:18:B1:7F:FF:FF 00:18:B1:FF:FF:FF

Other blocks registered to IBM Corp

00:02:55:00:00:00 /24 MA-L 00:04:AC:00:00:00 /24 MA-L 00:06:29:00:00:00 /24 MA-L 00:09:6B:00:00:00 /24 MA-L 00:0D:60:00:00:00 /24 MA-L 00:11:25:00:00:00 /24 MA-L 00:14:5E:00:00:00 /24 MA-L 00:17:EF:00:00:00 /24 MA-L 00:1A:64:00:00:00 /24 MA-L 00:20:35:00:00:00 /24 MA-L 00:21:5E:00:00:00 /24 MA-L 00:22:00:00:00:00 /24 MA-L