MA-L: a full /24 OUI block, IEEE's largest, covering 16,777,216 addresses.
Prefix00:12:4F:00:00:00 /24
Vendor address1665 Utica Avenue, Suite 700 St Louis Park MN US 55416
Country🇺🇸 United States
RegisteredSep 9, 2004
Block range00:12:4F:00:00:00– 00:12:4F: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
- Sep 9, 2004 – Jun 7, 2013 Tyco Thermal Controls LLC. name changed
- Jun 7, 2013 – May 3, 2018 Pentair Thermal Management name changedaddress changedcountry changed
- May 3, 2018 – Dec 11, 2025 nVent name changed
- Dec 11, 2025 – present Chemelex LLC
Example addresses in this block
Where this block sits
Previous
00:12:4E:00:00:00 /24
XAC AUTOMATION CORP.
Next
00:12:50:00:00:00 /24
Tokyo Aircaft Instrument Co., Ltd.
The nearest registered blocks of the same size on either side of this one in IEEE's address space.
Chemelex LLC holds 1 registered blocks in the IEEE registry, ranking #8,220 of 33,427 organizations by block count.