This entry covers Microsoft's PHYSICAL-hardware OUIs — Surface, Xbox, HoloLens, and peripherals — and is the counterpart to the separately documented Hyper-V virtual range 00:15:5D. All are registered to "Microsoft Corporation" (some legacy blocks "MICROSOFT CORP.") at One Microsoft Way, Redmond, with Microsoft holding about 101 prefixes total. A separate registrant, "Microsoft Mobile Oy" (Finland), covers the former Nokia phone lineage. The important limitation for enrichment: the IEEE registry labels every block simply "Microsoft Corporation" and does NOT map specific OUIs to Xbox-versus-Surface, so any claim that a given prefix is Xbox-only or Surface-only is inferred from device-identification sources, not the registry — treat per-device-family attributions as Likely. Verified physical-hardware samples include 70:F8:AE, with 7C:ED:8D commonly associated with Xbox and 60:45:BD / C4:9D:ED documented on Surface hardware. For triage, a Microsoft Corporation OUI on a wired/wireless segment usually means a Surface or Xbox; correlate with DHCP hostname/fingerprint to distinguish gaming consoles (often subject to traffic policy) from managed Surface fleet assets — and never confuse it with the 00:15:5D Hyper-V VM range.
- IEEE assignment
- ~101 prefixes → Microsoft Corporation, registered Redmond, WA, US [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L plus CID; ~101 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
- One Microsoft Way, Redmond, WA 98052, US [Confirmed] — IEEE MA-L
- Company status
- active [Confirmed] — microsoft.com
- Device types
- Surface tablets/laptops, Xbox 360/One/Series consoles, HoloLens, Microsoft peripherals/accessories [Confirmed] — maclookup.app
- Notable products
- Surface, Xbox, HoloLens
- Verified prefix sample
- 70:F8:AE (Confirmed Microsoft Corporation), 7C:ED:8D (Xbox-associated), 60:45:BD / C4:9D:ED (Surface), legacy 00:50:F2 [Registrant Confirmed; per-device attribution Likely] — maclookup.app
- Special note
- This is the physical-hardware counterpart to the separate Hyper-V virtual 00:15:5D entry. The IEEE registry labels all blocks "Microsoft Corporation" with NO product breakdown, so Xbox-vs-Surface OUI claims are inferred, not registry-backed. A separate "Microsoft Mobile Oy" registrant (Espoo, Finland) covers ex-Nokia phones. [Confirmed] — maclookup.app
- Related vendors
- Microsoft Mobile Oy (sibling phone registrant, Finland); 00:15:5D Hyper-V (same parent, virtual)
- Analyst note
- A Microsoft Corporation OUI usually means a Surface or Xbox; correlate with DHCP hostname/fingerprint to distinguish gaming consoles from managed Surface assets — and never confuse it with the 00:15:5D Hyper-V VM range.