OUI 18-65-C7 is an IEEE MA-L (24-bit) block assigned to Dongguan YIMO Technology Co., Ltd., a broadband-terminal-equipment manufacturer headquartered in Qingxi Town, Dongguan, Guangdong, China (postal code 523660). The block covers the full 18:65:C7:00:00:00–18:65:C7:FF:FF:FF range (~16 million addresses). YIMO, founded in 2017, builds GPON and XGS-PON optical network terminals (ONTs), home gateways, Wi-Fi 6 routers, and LTE/5G CPE, supplied primarily as OEM/ODM/JDM hardware to telecom operators rather than sold under its own retail brand — the company exhibits at operator-facing events such as Network X and MWC Barcelona. The practical consequence for OUI work: a device presenting 18:65:C7 is most likely ISP-deployed subscriber premises equipment (an ONT or home gateway), and because YIMO operates as a contract manufacturer the same hardware may ship rebranded under an operator's own label, so the OUI identifies the maker but not the brand on the box. No CVEs or public vulnerability disclosures name YIMO or its ymcnt.com products as of June 2026; however, the device class (OEM-built GPON ONT / home gateway) has a documented category-level history of shared firmware lineages, default or hardcoded credentials, and web-management authentication-bypass and command-injection bugs, so the OUI is a useful asset-classification signal but not by itself a trust signal. IEEE publishes no assignment date for this or any OUI; any "date registered" shown by third-party lookup tools is a database-maintenance artifact, not an IEEE fact.
- IEEE assignment
- OUI 18-65-C7 → Dongguan YIMO Technology Co., Ltd. [Confirmed] — enrichment/registries/oui.csv line 62; https://www.macvendorlookup.com/api/v1/1865C7
- Registry / block size
- MA-L (24-bit OUI / large block); covers 18:65:C7:00:00:00–18:65:C7:FF:FF:FF (~16.7M addresses) [Confirmed] — enrichment/registries/oui.csv line 62; https://www.macvendorlookup.com/api/v1/1865C7. 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 is a database artifact, not an IEEE fact.
- Registered address
- No.67, Qingxi Section, Qingzhang Road, Qingxi Town, Dongguan City, Guangdong Province, China 523660 [Confirmed] — enrichment/registries/oui.csv line 62; https://www.macvendorlookup.com/api/v1/1865C7
- HQ / country
- Dongguan, Guangdong, China (CN) [Confirmed] — https://www.ymcnt.com/
- Company status
- active [Confirmed] — https://www.ymcnt.com/
- Company profile
- founded 2017; broadband-terminal-equipment maker; OEM/ODM/JDM supplier to telecom operators; R&D in Shenzhen and Wuhan; manufacturing in Dongguan, Kunshan (China) and Vietnam; ~250–499 employees (third-party estimate) [Likely] — https://www.ymcnt.com/ ; https://networkxevent.com/sponsors/yimo-technology-co-ltd/ ; https://www.zoominfo.com/c/shenzhen-yimo-technology-co-ltd/483804564 (employee count and revenue band are ZoomInfo estimates, not company-confirmed)
- Device types
- GPON ONT, XGS-PON ONT, home gateway, Wi-Fi 6 router, LTE CPE, 5G CPE, smart projector [Confirmed] — https://www.ymcnt.com/ ; https://www.mwcbarcelona.com/exhibitors/dongguan-yimo-technology-co-ltd
- Market presence
- exhibitor at Network X and MWC Barcelona; operator-facing OEM/ODM business [Confirmed] — https://networkxevent.com/sponsors/yimo-technology-co-ltd/ ; https://www.mwcbarcelona.com/exhibitors/dongguan-yimo-technology-co-ltd
- Website
- https://www.ymcnt.com/ [Confirmed] — https://www.ymcnt.com/
- Security context
- no YIMO-specific CVEs, NVD entries, or CISA advisories found as of June 2026. Category-level risk applies to OEM-built GPON ONT / home gateway hardware: shared firmware lineages, default/hardcoded credentials, auth-bypass and command-injection in web management interfaces (documented across multiple GPON ONT makers). General PRC-nexus SOHO-router botnet advisories (CISA AA23-270A; ASD/ACSC Sept 2024) concern compromised devices broadly and do NOT name YIMO. [Likely] — https://medium.com/tenable-techblog/gpon-home-gateway-rce-threatens-tens-of-thousands-users-c4a17fd25b97 ; https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-270a ; https://media.defense.gov/2024/Sep/18/2003547016/-1/-1/0/CSA-PRC-LINKED-ACTORS-BOTNET.PDF
- Registration date
- Unknown — IEEE publishes no assignment dates; third-party "date registered" values are database artifacts, not IEEE facts. [Unknown]
- IANA reference
- none (not an IANA/RFC-governed assignment; column stays blank) [Confirmed]
- Cross-registry presence
- not found in mam.csv (MA-M) or oui36.csv (MA-S) — MA-L only [Confirmed] — enrichment/registries/oui.csv line 62
- Analyst note
- 18:65:C7 identifies the maker (YIMO), not the retail brand — as a contract manufacturer its hardware may ship rebranded under operator labels, so OUI alone won't tell you whose name is on the device; treat the OUI as an asset-classification hint, not a trust signal.