MA-S: a /36 block (also called an OUI-36 assignment), IEEE's smallest, covering 4,096 addresses.
Prefix70:B3:D5:5C:90:00 /36
Vendor address3F Ventureforum B'd, Pangyodae-ro Seung-nam Si Gyeonggi-Do KR 13488
Country🇰🇷 South Korea
RegisteredMay 22, 2020
Block range70:B3:D5:5C:90:00– 70:B3:D5:5C:9F: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
- May 22, 2020 – Jan 20, 2026 ICTK Holdings name changed
- Jan 20, 2026 – present ICTK Co., Ltd.
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.
ICTK Co., Ltd. holds 2 registered blocks in the IEEE registry, ranking #2,229 of 33,421 organizations by block count.
Other blocks registered to ICTK Co., Ltd.