The OUI prefix A8:8B:28 is a single IEEE MA-L block registered to "SHENZHEN DIYANG SMART TECHNOLOGY CO.,LTD." at Room 202, Building 4 of the Research & Creation Valley High-tech Incubation Park on Gongming Street, Guangming District, Shenzhen, Guangdong, China. The registry address embeds the vendor's stated website, diyangsmart.com, which was unreachable during research (the connection was refused on both the root and /en paths), so no product catalog, model list, or company description could be confirmed directly from the source. Outside the IEEE record the company leaves a thin public footprint: no FCC equipment-authorization filings, no CVE or CISA KEV entries, no Shodan or threat-intel mentions, and no B2B distributor listings surfaced for either the company name or the A8:8B:28 prefix. The "Smart Technology" suffix and a Guangming District incubator address are consistent with the IoT and smart-home hardware cluster common to that part of Shenzhen, but that is sector context for the area, not a confirmed product line for this specific registrant, so the device type is left genuinely unknown rather than guessed. One disambiguation matters for anyone researching the name: "Shanghai Diyang Industries Co., Ltd." is a separate, older Shanghai-based entity and should not be conflated with this Shenzhen OUI holder.
- IEEE assignment
- A8:8B:28 → SHENZHEN DIYANG SMART TECHNOLOGY CO.,LTD. [Confirmed] — IEEE MA-L (local registry: enrichment/registries/oui.csv, line 108)
- Registry / block size
- MA-L (24-bit OUI; ~16.7M addresses in the single block) [Confirmed] — enrichment/registries/oui.csv, line 108
- Registered address
- Room 202, Building 4, Research & Creation Valley High-tech Incubation Park, Gongming Street, Guangming District, Shenzhen, Guangdong, CN 518107 [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv, line 108). NOTE: the registry address field also embeds "(www.diyangsmart.com)".
- Country
- CN (China) [Confirmed] — enrichment/registries/oui.csv, line 108
- Registration date
- Unknown — IEEE publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); any third-party "date registered" is a database artifact, not an IEEE fact, so none is asserted here. [Unknown]
- Company status / website
- Listed website www.diyangsmart.com (from the IEEE address field) was unreachable at time of research — connection refused (ECONNREFUSED) on both the root and /en paths; active status could not be confirmed. [Likely offline at research time] — direct fetch attempt
- Device types
- Unknown — vendor website offline; no FCC filings, product catalog, B2B listings, or user reports found. The "Smart Technology" name and Guangming District (Shenzhen) location are consistent with the local IoT/smart-home manufacturing sector, but this is generic area context, not a confirmed product category for this vendor. [Unknown]
- FCC filings
- None found — fcc.report's Diyang company page shows an empty filings table (no FCC ID, IBFS, or ELS entries); no grantee code identified. [Likely] — https://fcc.report/company/Diyang
- Security context
- No CVEs, CISA KEV entries, threat-intel reports, Shodan exposure mentions, or security advisories found for this vendor or the A8:8B:28 prefix; no evidence of malicious use or active exploitation in public sources. [Confirmed — sourced null] — CVE/KEV/threat-intel search returned zero hits
- Disambiguation
- "Shanghai Diyang Industries Co., Ltd." (Shanghai-based, founded 2003, ~18 patents per PatSnap) appears to be a separate entity unrelated to this Shenzhen IEEE OUI holder. [Likely] — https://discovery.patsnap.com/company/shanghai-diyang-industries/
- Registry presence
- Found in oui.csv (MA-L); NOT present in the MA-M or MA-S (oui36) registry files. [Confirmed] — enrichment/registries/oui.csv
- IANA Reference
- (none — no RFC reference exists for this OUI entry; left blank, not fabricated)
- Analyst note
- An A8:8B:28 address reliably identifies hardware from this registrant for asset-classification purposes, but with the website offline and no product data published, the OUI cannot currently be tied to a specific device class or model line.