macadress

Swisscom Hospitality Services SA

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:12:66:00:00:00 /24
Vendor addressChemin de l'Etang 65 1211 Geneva CH
Country🇨🇭  Switzerland
RegisteredSep 15, 2004
Block range00:12:66:00:00:00– 00:12:66: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. Sep 15, 2004 – Sep 29, 2007 Private name changedaddress changedcountry changed
  2. Sep 29, 2007 – Dec 31, 2007 Swisscom-Eurospot name changedaddress changed
  3. Dec 31, 2007 – present Swisscom Hospitality Services SA

Example addresses in this block

00:12:66:00:00:00 00:12:66:7F:FF:FF 00:12:66:FF:FF:FF

Where this block sits

Previous 00:12:65:00:00:00 /24 Enerdyne Technologies, Inc. Next 00:12:67:00:00:00 /24 Panasonic Corporation

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

Swisscom Hospitality Services SA holds 1 registered blocks in the IEEE registry, ranking #28,768 of 33,421 organizations by block count.