MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:0C:EF:00:00:00 /24
Vendor addressUnit 6 Chelmsford Road Industrial Estate, Chelmsford Road, Great Dunmow Essex GB CM6 1HD
Country🇬🇧 United Kingdom
RegisteredApr 8, 2003
Block range00:0C:EF:00:00:00– 00:0C:EF: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
- Apr 8, 2003 – Nov 16, 2023 Open Networks Engineering Ltd name changedaddress changed
- Nov 16, 2023 – present ONE Investment Group Limited
Example addresses in this block
Where this block sits
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
ONE Investment Group Limited holds 1 registered blocks in the IEEE registry, ranking #22,013 of 33,427 organizations by block count.