Taicang T&W Electronics Co., Ltd. is a high-volume IEEE registrant, holding 45 OUI assignments across all three block sizes: 43 MA-L (24-bit) prefixes, one MA-M (28-bit) prefix (1845B3D), and one MA-S (36-bit) prefix (8C1F64FFB). The registry address is 89# Jiang Nan RD, Suzhou, Jiangsu 215412, China, with two blocks (D00ED9 and 64D954) carrying the expanded "Lu Du, Taicang" form — confirming the company sits in Taicang, an administrative district of Suzhou. A critical naming caveat: the "TW" in the slug and company name stands for the "T&W" brand, not Taiwan. This is a mainland China (CN) manufacturer; the firm's own ICP filing (粤ICP备10045088号) reflects PRC registration. T&W is an OEM/ODM networking-equipment maker — its lineage is shared with Shenzhen Gongjin Electronics, and the group supplies residential broadband gateways, Wi-Fi routers, xDSL/DOCSIS/GPON CPE, enterprise access points, and 5G FWA hardware to ISPs and consumer brands worldwide (reported customers include ASUS, D-Link, Netgear, ZyXEL, and Nokia). One material caveat for anyone classifying these MACs: firmware from the same T&W/Gongjin corporate family was found in 700,000+ ISP-distributed routers with critical flaws — directory traversal in webproc.cgi (CVE-2014-2962), hardcoded support credentials, and a memory-dump weakness — so a T&W OUI on ISP CPE warrants firmware scrutiny. As with every IEEE registrant, no assignment date is published; third-party "date registered" values are database artifacts, not IEEE facts.
- IEEE assignment
- 45 prefixes → Taicang T&W Electronics Co., Ltd., registered Taicang/Suzhou, Jiangsu, CN [Confirmed] — IEEE oui.csv / mam.csv / oui36.csv (enrichment/registries/*.csv)
- Registry / block size
- MA-L primary (43 × 24-bit OUI), plus 1 MA-M (28-bit: 1845B3D) and 1 MA-S (36-bit: 8C1F64FFB) — one of the larger single-vendor OUI counts in the registry [Confirmed] — enrichment/registries/oui.csv, mam.csv, oui36.csv. NOTE: IEEE's public OUI data publishes NO assignment/registration date; any "date registered" on third-party tools (maclookup.app shows 2014-04-22 for the earliest block 64:D9:54 and 2026-01-12 for the most recent 84:C6:65) is a database artifact, not an IEEE fact.
- HQ / country
- 89# Jiang Nan RD, Suzhou, Jiangsu 215412, CN (two blocks use the expanded "Lu Du, Taicang, Jiangsu" form) [Confirmed] — enrichment/registries/oui.csv
- Name clarification
- "TW" = "T&W" brand, NOT Taiwan; this is a mainland-China (PRC) manufacturer in Taicang, Jiangsu — corroborated by the company's ICP filing 粤ICP备10045088号 [Confirmed] — https://www.twsz.com/en/ , https://hwaddress.com/company/taicang-tw-electronics/
- Company status
- active [Confirmed] — https://www.twsz.com/en/
- Also known as / lineage
- Gongjin Electronics; Shenzhen Gongjin Electronics; T&W (twsz.com). The Taicang entity is the Jiangsu manufacturing arm sharing firmware and OEM lineage with the Shenzhen/parent entity [Confirmed] — https://www.twsz.com/en/ , https://techinfodepot.shoutwiki.com/wiki/Shenzhen_Gongjin_Electronics
- Device types
- residential broadband gateways/routers (xDSL/VDSL/G.fast, DOCSIS cable, GPON/XGS-PON fiber), Wi-Fi 6/7 routers, enterprise access points, SD-WAN routers, switches, 5G FWA / small cell, powerline adapters, range extenders, mesh systems, ONT/fiber gateways, VoIP IADs [Confirmed] — https://www.twsz.com/en/product/ , https://techinfodepot.shoutwiki.com/wiki/Shenzhen_Gongjin_Electronics
- Notable OEM customers
- ASUS, D-Link, Netgear (ISO 14001 supplier), ZyXEL, Motorola, eero, Nokia, DZS, SmartRG, TRENDnet, Alcatel-Lucent, Belkin [Confirmed] — https://techinfodepot.shoutwiki.com/wiki/Shenzhen_Gongjin_Electronics , https://www.netgear.com/images/pdf/TW_Taicang_ISO14001.pdf
- Sample MA-L prefixes (all Taicang T&W Electronics)
- E4DADF, 64D954, D00ED9, F80C58, 84C665 [Confirmed] — enrichment/registries/oui.csv
- Special note — security context
- firmware from the same T&W/Shenzhen Gongjin corporate family was found in 700,000+ ISP-distributed routers with multiple critical flaws — directory traversal in webproc.cgi exposing config.xml/admin credentials (CVE-2014-2962), a hidden hardcoded support-account password on ~60% of devices, and a memory-dump weakness on ~25%; affected branded units included ZTE, D-Link, Sitecom, FiberHome, Planet, Digisol, Observa Telecom. No CVEs specific to the "Taicang" entity name surfaced in 2024–2026 searches, but the underlying OEM firmware risk is well-documented. [Confirmed] — https://www.networkworld.com/article/936998/at-least-700000-routers-given-to-customers-by-isps-are-vulnerable-to-hacking-2.html , https://www.csoonline.com/article/550961/at-least-700000-routers-given-to-customers-by-isps-are-vulnerable-to-hacking.html
- Vendor website
- https://www.twsz.com/en/ [Confirmed] — https://maclookup.app/vendors/taicang-t-w-electronics
- Allocated date
- Unknown — IEEE does not publish registration dates for MAC/OUI assignments; no date data is present in the cached registry CSVs [Confirmed] — (no IEEE date exists; null)
- Analyst note
- a globally-administered T&W OUI on ISP-distributed CPE identifies genuine T&W/Gongjin hardware and should prompt firmware-version scrutiny given the documented OEM vulnerability history; treat third-party per-prefix "registration dates" as database artifacts, not IEEE facts.