macadress

ADVANCED TELECOMMUNICATIONS MODULES, LTD.

MA-L
MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:20:2B:00:00:00 /24
Vendor addressCambridge CB3 OBL GB
Country🇬🇧  United Kingdom
RegisteredApr 22, 1998
Block range00:20:2B:00:00:00– 00:20:2B: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 22, 1998 – Jun 5, 2002 ADVANCED TELECOMMUNICATIONS name changedaddress changedcountry changed
  2. Jun 5, 2002 – present ADVANCED TELECOMMUNICATIONS MODULES, LTD.

Example addresses in this block

00:20:2B:00:00:00 00:20:2B:7F:FF:FF 00:20:2B:FF:FF:FF

Where this block sits

Previous 00:20:2A:00:00:00 /24 N.V. DZINE Next 00:20:2C:00:00:00 /24 WELLTRONIX CO., LTD.

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

ADVANCED TELECOMMUNICATIONS MODULES, LTD. holds 1 registered blocks in the IEEE registry, ranking #4,240 of 33,421 organizations by block count.