The OUI prefix C4:79:9F is an IEEE MA-L (OUI-24) block assigned to Haiguang Smart Device Co., Ltd. (full name Dongguan Haiguang Smart Device Co., Ltd.; 东莞海光智能设备有限公司), a wireless-broadband CPE manufacturer based in Tangxia Town, Dongguan, Guangdong, China. The registry record lists the address as Room 202, 2nd Floor, 3rd Building, Kuiqiao Road No. 2, Tangxia Town, Dongguan. The company designs and builds cellular-connectivity hardware — 4G LTE routers, 5G CPE, MiFi/portable hotspots, industrial CPE, 4G modems, ONUs, WiFi 6 mesh units, fixed wireless phones, and home routers — sold largely through telecom-operator channels into 50-plus countries. The single most important caveat for anyone enriching this entry is a name collision: this Dongguan CPE maker is entirely unrelated to "Haiguang Information Technology Co., Ltd." (Hygon, 海光信息技术, Beijing, SSE:688041), the x86/DCU CPU vendor whose subsidiaries were placed on the U.S. BIS Entity List in 2019. That restriction targets the CPU company; no evidence ties the CPE manufacturer to those sanctions, and conflating the two would be a factual error. No CVEs, sanctions, FCC bans, or Entity-List entries were found for the Dongguan firm specifically. IEEE publishes no registration date for this or any OUI, so no assignment date is asserted here.
- IEEE assignment
- C4:79:9F → Haiguang Smart Device Co., Ltd. (MA-L / OUI-24 block) [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv line 129), maclookup.app/macaddress/c4799f
- Registry / block size
- MA-L (24-bit OUI). Found only in oui.csv; no match in mam.csv (MA-M) or oui36.csv (MA-S) [Confirmed] — IEEE MA-L registry scan. 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" on third-party tools (e.g. the "01 April 2023" value on maclookup.app) is a database artifact, not an IEEE fact.
- Registrant legal name
- Haiguang Smart Device Co., Ltd. — full form Dongguan Haiguang Smart Device Co., Ltd.; Chinese 东莞海光智能设备有限公司 [Confirmed] — IEEE MA-L, hgsdcn.com, maclookup.app/macaddress/c4799f
- Registry address / country
- Room 202, 2nd Floor, 3rd Building, Kuiqiao Road No. 2, Tangxia Town, Dongguan, Guangdong 523000, China (CN) [Confirmed] — IEEE MA-L, maclookup.app/macaddress/c4799f
- Current/alternate address
- The vendor's own site lists 6th Floor, 7th Building, Huixun WanQu Industrial Area, No. 4 Baoshi Road, Jiaoyitang, Tangxia Town, Dongguan — likely a later address than the registry record [Likely] — hgsdcn.com
- Company status
- active [Likely] — hgsdcn.com (live vendor site)
- Website
- https://www.hgsdcn.com/ [Confirmed] — hgsdcn.com
- Device types
- wireless CPE / mobile-broadband devices — 4G LTE routers, 5G CPE, MiFi / portable hotspots, industrial CPE, 4G modems, ONU, WiFi 6 mesh, fixed wireless phones, home routers [Confirmed] — hgsdcn.com, hgsdcn.com/Content/520187.html
- Industry
- cellular/wireless network-connectivity equipment (ODM/manufacturer), sold to telecom operators and end users in 50+ countries [Confirmed] — hgsdcn.com
- Founding year
- 2009 (per vendor site; single-source) [Likely] — hgsdcn.com
- Name-collision warning (CRITICAL)
- "Haiguang Smart Device Co., Ltd." (this OUI, Dongguan, CPE/wireless maker) is NOT "Haiguang Information Technology Co., Ltd." / Hygon (海光信息技术股份有限公司, Beijing, SSE:688041), the x86 CPU + DCU AI-accelerator vendor derived from AMD Zen. Hygon's subsidiaries (Chengdu Haiguang Integrated Circuit, Chengdu Haiguang Microelectronics Technology, Higon) were added to the U.S. BIS Entity List on 24 June 2019 over supercomputing/military end-use concerns. That action applies to the CPU vendor only — no evidence connects the CPE maker to it. [Confirmed] — en.wikipedia.org/wiki/Hygon_Information_Technology, sanctionsnews.bakermckenzie.com (5 Chinese entities added to Entity List), maclookup.app/macaddress/c4799f
- Security flags on the OUI holder
- none found — no CVEs, sanctions, FCC bans, or BIS Entity-List entries located for Dongguan Haiguang Smart Device Co., Ltd. specifically. As a Chinese 4G/5G CPE ODM it carries the generic supply-chain considerations common to any Chinese network-hardware vendor, but no specific public enforcement action was identified [Likely] — absence-of-evidence across web search (no citation can prove a negative)
- Notable context
- listed as an exhibitor at MWC Las Vegas; vendor reports a ~50-person R&D team and 200+ factory workers; states a 2015 strategic partnership with Sanechips (a UNISOC/Spreadtrum affiliate) for chipset supply [Likely] — mwclasvegas.com exhibitor listing, hgsdcn.com
- IANA Reference
- not applicable to an OUI entry — left blank [Confirmed] — no IANA RFC reference applies
- Analyst note
- A C4:79:9F address on a globally-administered MAC identifies genuine Haiguang Smart Device CPE/wireless hardware. Do not surface any IEEE "registration date" for this prefix (IEEE publishes none), and keep the Dongguan CPE maker clearly distinct from the Hygon CPU company in any copy or cross-link.