MSI / Micro-Star International — ~24 prefixes (MA-L) across name variants; OUI = brand (motherboard-NIC caveat)

MSI's MAC footprint spans several IEEE registrant spellings that should be normalized to one canonical vendor: "Micro-Star INTL CO., LTD." (~10 blocks), "MICRO-STAR INT'L CO.,LTD." (~8), "MICRO-STAR INTERNATIONAL CO., LTD." (~4), "Micro-Star International" (~1), and "MSI" (~1). A verified sample is 00:21:85. The registrant is in New Taipei City, Taiwan. These OUIs appear on motherboards, graphics cards, gaming laptops, desktops, monitors, and peripherals. An MSI OUI generally maps to the MSI brand, but there is an important classification nuance: the network interface is often on an MSI motherboard, so on a custom-built PC the OUI reflects the MSI motherboard's onboard NIC rather than a whole-system brand or system integrator. For triage, an MSI OUI usually means MSI-branded gaming or computing hardware, but on a custom build it identifies the MSI motherboard's onboard NIC, not the system builder — so add a "may be a custom build" caveat.

IEEE assignment

multiple spellings — "Micro-Star INTL CO., LTD." (~10), "MICRO-STAR INT'L CO.,LTD." (~8), "MICRO-STAR INTERNATIONAL CO., LTD." (~4), "Micro-Star International" (~1), "MSI" (~1) [Confirmed] — IEEE MA-L

Registry / block size

MA-L; ~24 blocks across variants [Confirmed] — maclookup.app / macverify.com (IEEE-sourced)

HQ / country

New Taipei City, Taiwan [Confirmed] — maclookup.app

Company status

active [Confirmed] — msi.com

Device types

motherboards, graphics cards, gaming laptops, desktops, monitors, peripherals [Confirmed] — maclookup.app

Notable products

MSI gaming laptops, MEG/MPG/MAG motherboards, GeForce graphics cards

Verified prefix sample

00:21:85 [Confirmed] — macverify.com

Special note

OUI generally maps to the MSI brand, but the NIC is often on an MSI motherboard — on a custom-built PC the OUI reflects the board's onboard NIC, not the whole-system brand. Normalize the several name spellings to one canonical vendor. The IEEE registry publishes no assignment dates, so none is stated here. [Confirmed]

Related vendors

none significant

Analyst note

An MSI OUI usually means MSI-branded gaming/computing hardware; on a custom-built PC the OUI reflects the MSI motherboard's onboard NIC, not the system integrator — add a "may be a custom build" caveat.