Shenzhen TCL New Technology Co., Ltd

A MAC address beginning with 40:8B:F6 or 5C:AD:76 belongs to Shenzhen TCL New Technology Co., Ltd, a Shenzhen-based subsidiary of TCL Technology Group. Devices using these prefixes are typically Android-based smart TVs or set-top-box-adjacent embedded hardware from the TCL brand.

IEEE's registry lists two separate MA-L (/24) assignments under this exact registrant name: 408BF6, registered to the TCL Building at #5 Central Nanhai Road, and 5CAD76, registered to the TCL Multimedia Building at #1001 Zhongshan Park Road -- both in Shenzhen's Nanshan District, Guangdong. IEEE does not publish assignment dates for either block.

The registrant is identifiable beyond a bare OUI filing: it operates from TCL's Shenzhen multimedia campus, and third-party company profiles describe its business scope as TV software, network set-top boxes, and digital communication equipment, with a substantial patent portfolio. Two independently registered blocks under the same name and address family reinforce that this is an active manufacturer, not a shell registrant.

Security researchers have documented vulnerabilities in TCL-brand Android smart TVs, including an unauthenticated information-disclosure flaw (CVE-2020-27403) and an unauthenticated denial-of-service flaw in UPnP/DLNA handling (CVE-2025-55972), plus a 2020 disclosure of additional flaws and remote-modification concerns. These findings target the TCL brand generally; no source ties them to MAC traffic from 408BF6 or 5CAD76 specifically.

Registrant

Shenzhen TCL New Technology Co., Ltd, a subsidiary of TCL Technology Group

Assignment count

Two MA-L (/24) OUI blocks confirmed under this exact registrant name

Registered addresses

TCL Building, Nanshan District, Shenzhen (408BF6); TCL Multimedia Building, Nanshan District, Shenzhen (5CAD76)

Security note

Two CVEs documented for TCL-brand Android smart TVs (device-category match; not confirmed to these specific MAC blocks)

Vendor name

Shenzhen TCL New Technology Co., Ltd [Confirmed] (the IEEE MA-L registry 408BF6; the IEEE MA-L registry 5CAD76)

Registry class

MA-L (Media Access Control - Large) [Confirmed] (the IEEE MA-L registry 408BF6)

Prefixes

408BF6, 5CAD76 [Confirmed] (the IEEE MA-L registry 408BF6; the IEEE MA-L registry 5CAD76)

Registered address (408BF6)

TCL Building, #5 Central Nanhai Road, Nanshan District, Shenzhen, Guangdong CN 518067 [Confirmed] (the IEEE MA-L registry 408BF6)

Registered address (5CAD76)

B area, 10 Floor, TCL Multimedia Building, TCL International E City, #1001 Zhongshan Park Road, Nanshan District, Shenzhen, Guangdong CN 518052 [Confirmed] (the IEEE MA-L registry 5CAD76)

Registration date

Unknown -- IEEE publishes no assignment dates for OUI registrations [Confirmed]

Parent group

TCL Technology Group, headquartered in Huizhou, Guangdong [Likely] (https://en.wikipedia.org/wiki/TCL_Technology)

Business scope

TV software development, network set-top boxes, digital/wireless communication equipment [Likely] (https://discovery.patsnap.com/company/shenzhen-tcl-new-technology/)

Security context

CVE-2020-27403, unauthenticated information disclosure in TCL Android Smart TVs [Confirmed] (https://www.sentinelone.com/vulnerability-database/cve-2020-27403/)

Security context

CVE-2025-55972, unauthenticated denial-of-service via UPnP/DLNA in a TCL 65C655 Smart TV [Confirmed] (https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2025-55972)