MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:21:E3:00:00:00 /24
Vendor address1570 Oakland Road San Jose CA US 95131
Country🇺🇸 United States
RegisteredJun 18, 2008
Block range00:21:E3:00:00:00– 00:21:E3: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
- Jun 18, 2008 – Jun 23, 2009 BusTek LLC name changed
- Jun 23, 2009 – present SerialTek LLC
Example addresses in this block
Where this block sits
Previous
00:21:E2:00:00:00 /24
visago Systems & Controls GmbH & Co. KG
Next
00:21:E4:00:00:00 /24
I-WIN
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
SerialTek LLC holds 1 registered blocks in the IEEE registry, ranking #25,765 of 33,427 organizations by block count.