Tianjin Changdatong Technology Co., LTD (天津长大通科技有限公司) holds a single IEEE MA-L block, DC:D1:60, registered to a Tianjin Pilot Free Trade Zone address in the Airport Economic Zone. The vendor is an industrial-automation hardware maker rather than a consumer-networking or IT-infrastructure brand, which matters for asset classification: a DC:D1:60 address most plausibly belongs to operational-technology (OT) equipment on a plant or process network, not an office laptop or access point. Public sources describe the product line as programmable controllers (PLC-class), data-acquisition modules (SSI, DI, DO, AI, AO), and OEM Ethernet switches, deployed in heavy-industry settings such as metallurgy (continuous casting, high-speed wire-rod lines), rail transit, water treatment, and district heating. The company presents itself as linked to Changdatong Technology (Beijing) Co., Ltd. (畅达通科技(北京)有限公司), founded 2016, with the Tianjin entity described as a subsidiary; this parent/subsidiary relationship is from vendor self-description and is tagged Likely rather than Confirmed. No registration date is published: IEEE issues none, and a "June 26, 2023" value seen on third-party aggregators is a database artifact, not an IEEE fact. No vendor-specific CVEs, Shodan clusters, or threat-intelligence references were found, though the general unpatched-ICS/OT risk posture applies to any such embedded device exposed on a routable network.
- IEEE assignment
- DC:D1:60 → Tianjin Changdatong Technology Co.,LTD [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv line 28; mirrored at https://maclookup.app/macaddress/DCD160)
- Registry / block size
- MA-L (24-bit OUI / OUI-24, ~16.7M addresses); single block for this vendor (no MA-M/MA-S match) [Confirmed] — IEEE MA-L (oui.csv); https://hwaddress.com/company/tianjin-changdatong-technology-coltd/. NOTE: IEEE public OUI data publishes NO assignment/registration date; any "date registered" (e.g. maclookup.app's "June 26, 2023") is a third-party database artifact, not an IEEE fact.
- HQ / country
- Unit 601, 602, Building 1, Zhongxing Industrial Base, No. 2 East 7th Road, Tianjin Pilot Free Trade Zone (Airport Economic Zone), Tianjin, China 300308 [Confirmed] — IEEE MA-L (oui.csv); https://hwaddress.com/company/tianjin-changdatong-technology-coltd/
- Country
- China (CN) [Confirmed] — IEEE MA-L
- Company status
- active (vendor site cdt-tech.cn reachable) [Likely] — http://cdt-tech.cn/en
- Device types
- industrial automation hardware — programmable controllers (PLC-class), data-acquisition modules (SSI, DI, DO, AI, AO), and managed/unmanaged OEM Ethernet switches; NOT consumer networking or IT infrastructure [Likely] — http://cdt-tech.cn/en ; http://cdt-tech.cn/article/5264167242106749 (vendor self-description, single-source)
- Industry verticals
- metallurgy (steel / continuous casting), rail transit, water treatment, district/heat heating, general industrial automation [Likely] — http://cdt-tech.cn/en ; http://cdt-tech.cn/article/5264167242106749 (vendor self-description)
- Parent company
- Changdatong Technology (Beijing) Co., Ltd. (畅达通科技(北京)有限公司), founded 2016; Tianjin entity described as a wholly-owned subsidiary [Likely] — http://cdt-tech.cn/en ; http://cdt-tech.cn/article/5264167242106749 (vendor self-description, not independently verified)
- Vendor website
- http://cdt-tech.cn (English section http://cdt-tech.cn/en); serves a self-signed TLS certificate, so HTTPS is blocked by browser trust while HTTP is reachable [Confirmed] — http://cdt-tech.cn/en
- Registration date
- Unknown — IEEE publishes no OUI registration dates; third-party "June 26, 2023" is a database artifact and must not be presented as an IEEE fact [Unknown] — (no citable source)
- Security context
- no CVEs, Shodan clusters, malware associations, or threat-intel references found for the vendor or DC:D1:60; low public internet footprint. Devices are ICS/OT-class (PLC, data acquisition, OT switches) and carry the general risk posture of any unpatched embedded industrial device on a routable network, but no vendor-specific incidents surfaced [Likely] — (negative finding; no citable source)
- Analyst note
- a DC:D1:60 address most likely identifies OT/industrial-control equipment, not office IT; treat its presence as a signal to check OT-network segmentation rather than as a generic endpoint.