OUI 7C:EF:40 is a single MA-L block (24-bit prefix, ~16.7M addresses) registered to Nextorage Corporation, a Japanese storage-device maker headquartered in Kawasaki, Kanagawa. Nextorage was founded on 1 October 2019 by engineers spun out of Sony's memory-storage division, carrying two decades of Sony storage experience, and was acquired by Phison Electronics in January 2022. Its catalogue is storage-centric — internal NVMe M.2 SSDs (PCIe Gen4/Gen5), portable USB and USB4 SSDs, CFexpress Type A/B and SDXC/microSDXC memory cards, and USB card readers — products that, with one exception, carry no network interface. The exception that best explains an OUI assignment is the NX-PFS1PRO Professional Secure SSD (announced November 2025), which embeds an onboard Wi-Fi module so the drive can be unlocked from a phone's web browser and auto-unlocked inside pre-defined Wi-Fi zones, alongside hardware AES encryption and an auto-erase-on-tamper feature. Note a sequencing caveat: third-party databases first indexed this OUI in February 2022, well before the NX-PFS1PRO announcement, so the exact device behind the block is unconfirmed — it may cover an earlier prototype, a future device, or manufacturing infrastructure rather than the shipped product. As with every OUI, no IEEE registration date exists: the "2022-02-05" shown by maclookup.app is the date that third-party crawler first indexed the prefix, not an IEEE-issued timestamp, and must never be presented as an IEEE fact.
- IEEE assignment
- 7C:EF:40 → Nextorage Corporation (raw hex 7CEF40) [Confirmed] — IEEE MA-L, oui.csv line 642
- Registry / block size
- MA-L (24-bit OUI; ~16.7M addresses) [Confirmed] — enrichment/registries/oui.csv (line 642); not present in mam.csv (MA-M) or oui36.csv (MA-S)
- Registered address
- Kawasaki-eki-mae Tower Riverk 9F, 12-1, Ekimaehoncho, Kawasaki-ku, Kawasaki City, Kanagawa, JP 210-0007 [Confirmed] — IEEE MA-L registry address
- HQ / country
- Kawasaki, Kanagawa, Japan (registry address matches corporate HQ) [Confirmed] — https://www.nextorage.net/en/company/
- Registration date
- Unknown — IEEE publishes NO assignment/registration date for OUI/MAC prefixes. maclookup.app shows "2022-02-05" as first-seen/last-modified; that is a third-party database artifact (crawler index date), NOT an IEEE fact — do not surface it as a registration date. [Unknown — by design, no fabrication] — https://maclookup.app/vendors/nextorage-corporation
- Company status
- active [Confirmed] — https://www.nextorage.net/en/
- Founded
- 1 October 2019, by engineers from Sony's memory-storage division (20+ years Sony storage experience) [Confirmed] — https://www.nextorage.net/en/company/, https://us.metoree.com/companies/100072/
- Parent company
- Phison Electronics (acquired January 2022) [Confirmed] — https://www.guru3d.com/story/phison-acquires-nextorage-to-strengthen-customized-high-end-storage-market
- Device types
- internal NVMe M.2 SSDs (PCIe Gen4/Gen5), portable USB / USB4 (40Gbps) external SSDs, CFexpress Type A/B memory cards, SDXC/microSDXC cards, USB card readers [Confirmed] — https://www.nextorage.net/en/
- Likely networked product
- NX-PFS1PRO Professional Secure SSD (announced Nov 2025) — onboard Wi-Fi for browser-based unlock and automatic zone-unlock; the only Nextorage product line reviewed with a network interface. The NX-PS1PRO portable SSD (USB4 40Gbps) has no wireless; internal SSDs and memory cards have none. OUI was indexed Feb 2022, predating the NX-PFS1PRO announcement, so exact product mapping is unconfirmed. [Likely] — https://www.nextorage.net/en/ssds/ps1pro/, https://www.gizmochina.com/2025/11/10/nextorage-nx-pfs1pro-ssd-launched-specs-price/, https://www.notebookcheck.net/New-Nextorage-portable-SSD-offers-up-to-8-TB-of-fast-storage-in-small-chassis-with-display.1160555.0.html
- Security note
- No CVEs or public vulnerability disclosures found for Nextorage or any Nextorage product as of June 2026. The NX-PFS1PRO's Wi-Fi is for physical access control (lock/unlock), not general data networking — hardware AES encryption and remote-wipe/auto-erase are present. The browser-based unlock interface is the attack surface of note if exposed on an untrusted network. [Likely] — https://www.gizmochina.com/2025/11/10/nextorage-nx-pfs1pro-ssd-launched-specs-price/, https://www.cvedetails.com/
- Analyst note
- a 7C:EF:40 globally-administered address identifies genuine Nextorage hardware; given the storage-only catalogue, a network sighting most plausibly maps to the Wi-Fi-enabled NX-PFS1PRO secure SSD, but the product binding is not confirmed by Nextorage or IEEE and should not be stated as fact.