MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:25:CA:00:00:00 /24
Vendor addressW66 N220 Commerce Court Cedarburg WI US 53012
Country🇺🇸 United States
RegisteredApr 12, 2009
Block range00:25:CA:00:00:00– 00:25:CA: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 12, 2009 – Jan 21, 2022 LS Research, LLC name changed
- Jan 21, 2022 – Nov 10, 2025 Laird Connectivity name changed
- Nov 10, 2025 – present Ezurio, LLC
Example addresses in this block
Where this block sits
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00:25:C9:00:00:00 /24
SHENZHEN HUAPU DIGITAL CO., LTD
Next
00:25:CB:00:00:00 /24
Reiner SCT
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Ezurio, LLC holds 7 registered blocks in the IEEE registry, ranking #419 of 33,421 organizations by block count.
Other blocks registered to Ezurio, LLC