The MA-L block 50:D3:3B is registered to "cloudnineinfo" — the lowercase string carried verbatim in the IEEE registry row, with the registrant address xiaoshan Wujin load #19, hangzhou, zhejiang, CN 311258. That registry name maps to Cloudnine Information Technologies Co., Ltd. (CNIT), the Hangzhou, China company behind cloudnineinfo.com, founded in August 2020. CNIT is an AIDC/ICT infrastructure manufacturer: its catalog spans data-center and campus switches, industrial switches, rack and edge servers, AI workstations, GPU/DPU accelerators, all-flash and hybrid storage, IoT gateways, and embedded industrial PCs, alongside power and cooling gear. Two facts matter most for OUI work here. First, CNIT runs a substantial ODM/OEM and white-label line — it lists "Customized and White-label Products" as a core business — so a device presenting the 50:D3:3B prefix may ship under a customer's brand rather than CNIT's, and the OUI is the more reliable provenance signal than any label on the chassis. Second, "Cloud Nine" is a crowded name: at least two unrelated Chinese entities share it (a Shanghai cloud MSP, CLOUD NINE INFO TECH CO., LIMITED, and the defunct UK ISP CloudNine Communications), and neither holds this block — only CNIT does. As with any IEEE OUI, no registration date is published by IEEE; the "April 2023" value shown by third-party lookup tools is a database artifact, not an IEEE fact.
- IEEE assignment
- 50:D3:3B → cloudnineinfo, registered Hangzhou, Zhejiang, CN [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv line 106; corroborated by maclookup.app/macaddress/50d33b)
- Registry / block size
- MA-L (24-bit OUI, MAC Address Block Large, ~16.7M addresses; formerly "OUI") [Confirmed] — IEEE MA-L. NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); the "17 April 2023" date on third-party tools (maclookup.app) is a database artifact, not an IEEE fact — do not attribute it to IEEE.
- Registry organization name
- cloudnineinfo (lowercase, verbatim from the IEEE registry row) [Confirmed] — IEEE MA-L / maclookup.app
- HQ / country
- xiaoshan Wujin load #19, hangzhou, zhejiang, CN 311258 (registry address, as written; reads as Xiaoshan Wujin Road #19, Hangzhou, Zhejiang 311258, China) [Confirmed] — IEEE MA-L; vendor site cloudnineinfo.com/Abouten gives the same Hangzhou address
- Legal entity
- Cloudnine Information Technologies Co., Ltd. (CNIT), cloudnineinfo.com; founded August 2020; self-reported 2,000+ employees and 140,000+ sq m of facilities incl. a 50,000+ sq m manufacturing base [Likely] — cloudnineinfo.com/Abouten + baike.baidu.com/en entry for the company (vendor-self-reported scale figures; mapping of registry "cloudnineinfo" to CNIT is two-angle: registry address matches the vendor's stated HQ)
- Company status
- active [Confirmed] — cloudnineinfo.com
- Device types
- data-center / campus / industrial switches, rack & edge servers, AI workstations, PCIe/OAM GPUs, DPUs, all-flash & hybrid storage, IoT gateways, embedded industrial PCs, plus power/cooling (UPS, PDU) [Confirmed] — cloudnineinfo.com/en + /Enterpriseen + baike.baidu.com/en
- Business model
- ODM/OEM and white-label alongside self-branded lines ("Customized and White-label Products" is a stated core business). Devices may carry CNIT's OUI under a customer's brand. [Confirmed] — cloudnineinfo.com/Abouten + baike.baidu.com/en
- Name disambiguation
- distinct from (1) CLOUD NINE INFO TECH CO., LIMITED (sh-cloudnine.com, Shanghai cloud MSP — no networking hardware, not the registrant) and (2) CloudNine Communications (defunct UK ISP). Only CNIT (Hangzhou) holds 50:D3:3B. [Confirmed] — sh-cloudnine.com, en.wikipedia.org/wiki/CloudNine_Communications
- Security context
- no CVEs, public vulnerability advisories, threat-intel reports, or Shodan sighting data found for CNIT or the 50:D3:3B prefix. As a China-based ODM/OEM, devices may appear in enterprise, data-center, or industrial environments under CNIT or customer brands; standard supply-chain and geo-provenance review applies to unknown devices, as with any Zhejiang-domiciled ODM. [Likely] — absence-of-evidence from web/CVE/threat-intel searches (no hits); not a positive clearance
- IANA reference
- none — OUI entries carry no IANA RFC reference; field intentionally blank [Confirmed] — n/a for OUI
- Analyst note
- a 50:D3:3B address is a reliable signal of CNIT-manufactured hardware (including white-labeled units), but tells you nothing about the selling brand; pair OUI with device fingerprinting when the chassis label and OUI disagree.