MA-S: a /36 block (also called an OUI-36 assignment), IEEE's smallest, covering 4,096 addresses.
Prefix70:B3:D5:B1:20:00 /36
Vendor addressConca de Barbera Castellar del Vallés Barcelona / Spain ES 08122
Country🇪🇸 Spain
RegisteredOct 1, 2019
Block range70:B3:D5:B1:20:00– 70:B3:D5:B1:2F:FF
Address capacity4,096
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
- Oct 1, 2019 – Dec 2, 2020 SFR name changedaddress changedcountry changed
- Dec 2, 2020 – present VTEQ
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.
VTEQ holds 1 registered blocks in the IEEE registry, ranking #31,817 of 33,421 organizations by block count.