MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:1C:91:00:00:00 /24
Vendor address5919 Sea Otter Place Carlsbad CA US 92010
Country🇺🇸 United States
RegisteredMay 13, 2007
Block range00:1C:91:00:00:00– 00:1C:91: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
- May 13, 2007 – Mar 11, 2020 Gefen Inc. name changedaddress changed
- Mar 11, 2020 – Mar 13, 2020 Nortek Security & Control, LLC name changed
- Mar 13, 2020 – present Gefen LLC
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.
Gefen LLC holds 1 registered blocks in the IEEE registry, ranking #13,415 of 33,427 organizations by block count.