ASUS holds about 93 MA-L blocks registered as "ASUSTek COMPUTER INC." (the exact IEEE rendering, with all-caps "ASUSTek"), based in the Beitou District of Taipei, Taiwan. The same OUI pool spans a wide range of device classes — motherboards, laptops (ZenBook, ROG, VivoBook), routers (RT-AX series, ROG Rapture), graphics cards, and mini PCs — so the OUI alone won't tell you whether a given ASUS MAC is a motherboard NIC, a laptop, or a router. ASUS routers in particular are very common in consumer and prosumer networks. The brand maps cleanly to the device maker (no chipset-vs-brand ambiguity). For triage, an ASUS OUI often indicates a prosumer router or a gaming/enthusiast PC NIC; on an enterprise network an ASUS RT-series router OUI is a classic rogue-AP/shadow-IT signal worth investigating against sanctioned inventory.
- IEEE assignment
- ~93 prefixes → ASUSTek COMPUTER INC., registered Taipei, Taiwan [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L; ~93 blocks [Confirmed assignment] — maclookup.app (IEEE-derived; count is a current third-party snapshot and drifts). NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" from third-party tools is a database artifact, not an IEEE fact.
- HQ / country
- Beitou District, Taipei, Taiwan [Likely — HQ is Beitou; per-block addresses vary] — IEEE MA-L
- Company status
- active [Confirmed] — asus.com
- Device types
- motherboards, laptops (ZenBook, ROG, VivoBook), routers (RT-AX series, ROG Rapture), graphics cards, mini PCs [Confirmed] — maclookup.app
- Notable products
- ROG, ZenBook, RT-AX/ROG Rapture routers
- Verified prefix sample
- 40:16:7E, 4C:ED:FB, 7C:10:C9 [Confirmed] — maclookup.app
- Special note
- ASUS routers are very common in consumer/prosumer networks; the same OUI pool spans motherboards, laptops, and routers, so OUI alone won't distinguish device class. [Confirmed] — maclookup.app
- Related vendors
- ASRock (separate registrant historically, ASUS-affiliated lineage)
- Analyst note
- An ASUS OUI often indicates a prosumer router or a gaming/enthusiast PC NIC; on enterprise networks an ASUS RT-series router OUI is a classic rogue-AP/shadow-IT signal worth investigating.