Comheart OUIs map to Sichuan Tianyi Comheart Telecom Co., Ltd. (四川天邑康和通信股份有限公司), a publicly listed Chinese telecom-equipment maker (Shenzhen GEM board, stock code 300504) founded in 2001 and headquartered at No. 198, Section 1, Snow Mountain Avenue, Dayi County, Chengdu, Sichuan. The vendor holds an unusually large block portfolio — 87 MA-L (24-bit) assignments plus one MA-M (28-bit / OUI-28) assignment, 78C2C06 — roughly 1.5 billion addresses across the set, which is why a single consolidated vendor entry is far more useful than dozens of near-identical per-prefix pages. The product line is overwhelmingly ISP-supplied customer-premises equipment: GPON ONU/ONT fiber broadband terminals, residential GPON gateways, 5G CPE routers, Wi-Fi 6 routers, and IPTV set-top boxes, alongside passive optical components (PLC splitters, fiber patch cords, heat-shrinkable closure kits). Devices reach end users through telecommunications operators rather than retail, and the company describes long-standing relationships with mainstream carriers at home and abroad. The practical triage implication: a Comheart MAC on a network almost always flags a carrier-provisioned residential or SOHO fiber/broadband gateway. No CVEs name Comheart-branded hardware as of the research date, but a related — and legally distinct — entity, Sichuan Tianyi Kanghe Communication, carries CVE-2023-41010 (default-password issue on a TEWA-700G gateway); the two share the "Tianyi" brand cluster and must not be conflated. As with any operator-supplied GPON/CPE class, the generic concerns apply: default telnet/SSH credentials, firmware update channels, and exposed web-admin interfaces. IEEE publishes no registration dates for these blocks; third-party per-prefix "registration dates" are database artifacts, not IEEE facts.
- IEEE assignment
- ~89 prefixes → Sichuan Tianyi Comheart Telecom Co., Ltd., Chengdu, Sichuan, CN [Confirmed] — enrichment/registries/oui.csv, enrichment/registries/mam.csv
- Registry / block size
- 87 MA-L (24-bit OUI) assignments + 1 MA-M (28-bit / OUI-28) assignment (78C2C06); no MA-S (36-bit) blocks found; ~1.5B total addresses [Confirmed] — enrichment/registries/oui.csv, enrichment/registries/mam.csv, enrichment/registries/oui36.csv. NOTE: IEEE's public OUI/MA-M data publishes NO assignment/registration date; any "date registered" on third-party tools (e.g. maclookup.app 2013–2026 range) is a database artifact, not an IEEE fact.
- HQ / country
- No. 198, Section 1, Snow Mountain Avenue, Jinyuan Town, Dayi County, Chengdu, Sichuan, CN 611330 (majority registry address); a subset, including the MA-M entry, uses FL12, Tower B, Tianyi International Hotel, No. 2 West Section One, Second Ring Road, Chengdu, Sichuan, CN 610000 [Confirmed] — enrichment/registries/oui.csv, enrichment/registries/mam.csv, https://en.tianyisc.com/
- Company status
- active — publicly listed (Shenzhen Stock Exchange GEM board, code 300504, since 2018); founded 2001; ~2,800 employees [Confirmed] — https://en.tianyisc.com/, https://www.emis.com/php/company-profile/CN/
- Device types
- GPON ONU/ONT fiber broadband terminals, GPON residential gateways, 5G CPE routers, Wi-Fi 6 routers, IPTV set-top boxes; passive optical components (PLC splitters, fiber patch cords, heat-shrinkable closure/sleeve kits) [Confirmed] — https://en.tianyisc.com/, https://m.made-in-china.com/company-hsaknzhang/
- Notable products
- TG5241 GPON ONU (4× GbE, 1× POTS, dual-band 802.11ac/n Wi-Fi, ITU-T G.984 compliant; residential/SOHO via telco operators) [Confirmed] — https://en.tianyisc.com/product-view.aspx?t=15&id=90
- Verified sample prefixes (MA-L)
- A4:A5:28, FC:91:89, 04:43:FD, 1C:0E:D3, 24:06:F2 [Confirmed] — enrichment/registries/oui.csv
- Verified sample prefix (MA-M / OUI-28)
- 78:C2:C0:6 [Confirmed] — enrichment/registries/mam.csv
- Operator context
- devices are ISP-supplied CPE deployed by telecom operators; company cites relationships with mainstream carriers at home and abroad; product mix (GPON ONT/ONU, IPTV STB, 5G CPE) plus Chinese base points to China Telecom and similar carriers, also exported globally [Likely] — https://en.tianyisc.com/, https://www.linkedin.com/company/sichuan-tianyi-comheart-telecom-co-ltd
- Security context
- no CVEs naming "Sichuan Tianyi Comheart Telecom" / "tianyisc" found in NVD/MITRE as of research date; a related but DISTINCT entity, Sichuan Tianyi Kanghe Communication Co., Ltd, has CVE-2023-41010 (insecure permissions / default password on TEWA-700G gateway) — do not conflate. Generic operator-CPE risk class applies: default telnet/SSH credentials, firmware update channels, web-admin exposure [Likely] — https://nvd.nist.gov/vuln/detail/CVE-2023-41010, https://en.tianyisc.com/
- Related vendors / data trap
- "Sichuan Tianyi Kanghe Communication" shares the "Tianyi" brand cluster but is a separate legal entity with its own CVE history (CVE-2023-41010); do not merge [Confirmed] — https://nvd.nist.gov/vuln/detail/CVE-2023-41010
- Website
- https://en.tianyisc.com/ [Confirmed] — https://maclookup.app/vendors/sichuan-tianyi-comheart-telecom-co-ltd
- Analyst note
- a Comheart OUI flags ISP-supplied broadband CPE (GPON ONT/ONU, 5G CPE router, or IPTV STB) deployed by a telecom operator — overwhelmingly a residential or SOHO premises device; with ~89 prefixes / ~1.5B address space, a high-volume OEM supplier. Triage as operator-provisioned home-gateway class. No fabricated registration dates — IEEE publishes none for these blocks.