Contec — Americas / Japan Parent-Subsidiary Pair (MA-S / MA-L)

A MAC address beginning with one of the Contec-registered prefixes below identifies hardware from Contec Americas Inc., a Melbourne, Florida industrial-computing vendor and the confirmed US subsidiary of CONTEC CO., LTD. of Japan, its parent company, which separately holds a full MA-L block of its own.

Contec Americas Inc. holds seven MA-S /36 sub-allocations carved out of the IEEE-administered shared base 70:B3:D5 — not the base itself, which also serves roughly 4,092 unrelated registrants. Its documented products span fanless industrial and embedded computers, single-board computers, data-acquisition I/O modules, industrial servers, motherboards, and networking gear, confirmed via its own storefront and Intel and Mitsubishi Electric partner directories.

CONTEC CO., LTD. of Japan, the confirmed parent company, separately holds a full, non-shared MA-L block, 00:80:4C. Its SolarView monitoring product line suffered an actively-exploited remote-code-execution flaw (CVE-2022-29303), hijacked by Mirai-variant botnets before a July 2023 patch — legitimate brand-level security context, though no verified link ties SolarView hardware to any specific MAC sub-block above.

A third IEEE registrant, Contec GmbH of Germany (74:6F:3D), also uses the "Contec" name but is out of scope for this entry: the entry's own research found no evidence connecting it corporately to Contec Americas Inc. or the Japan parent, so its block is not claimed here. None of these should be confused with Contec Medical Systems Co., Ltd. of China, the unrelated company behind the CMS8000 patient-monitor backdoor (CVE-2025-0626 and related CVEs).

IEEE assignments

two registrants merged onto this slug as a confirmed parent-subsidiary pair — Contec Americas Inc. (US, MA-S sub-allocations of shared 70:B3:D5 base) and CONTEC CO., LTD. (JP, MA-L 00:80:4C) [Confirmed] — the IEEE MA-S registry, the IEEE MA-L registry

Registry / block size

Contec Americas Inc. holds 7 MA-S /36 sub-allocations (the IEEE MA-S registry keys 70B3D5914, 70B3D5363, 70B3D5883, 70B3D58B7, 70B3D5D10, 70B3D5392, 70B3D55D2) of the IEEE-administered shared base 70:B3:D5, not the base itself [Confirmed] — the IEEE MA-S registry

HQ / country (Contec Americas Inc.)

3991 Sarno Rd, Melbourne, FL 32934, US [Confirmed] — the IEEE MA-S registry

HQ / country (CONTEC CO., LTD.)

3-9-31, Himesato, JP [Confirmed] — the IEEE MA-L registry (key 00804C)

Company status

Contec Americas Inc. active, documented US subsidiary of CONTEC CO., LTD. of Japan [Confirmed] — us.contec.com/pages/about-contec-americas

Device types

fanless industrial/embedded computers, single-board computers, DAQ I/O modules, industrial servers, motherboards, industrial/medical displays, networking (switches/Wi-Fi), IoT products [Likely] — us.contec.com

Partner directories

listed in Intel and Mitsubishi Electric partner showcases [Confirmed] — intel.com, us.mitsubishielectric.com

Security context

SolarView (CONTEC CO., LTD. Japan) suffered CVE-2022-29303, an unauthenticated RCE exploited by Mirai-variant botnets against roughly 800 units, patched July 2023 [Confirmed] — securityweek.com, vulncheck.com, contec.com/products-services/environmental-monitoring/solarview

Security context (negative)

no CVE or advisory recorded against Contec Americas Inc. itself or its specific MAC sub-blocks, as of an August 2026 search [Confirmed]

Excluded lookalike

Contec GmbH (Germany), MA-L block 74:6F:3D, is a separate IEEE registrant using the same "Contec" name. No evidence was found linking it corporately to Contec Americas Inc. or CONTEC CO., LTD., so it is not claimed by this entry's prefixes. Its normalized slug collides with this entry's (slugifyVendor strips both gmbh and the corporate suffixes here), so it requires its own disambiguated key in a separate entry rather than being folded in.

[Confirmed] — the IEEE MA-L registry (key 746F3D)

Not this vendor

Contec Medical Systems Co., Ltd. (China) CMS8000 backdoor (CVE-2025-0626, CVE-2025-0683, CVE-2024-12248) is an unrelated company, no corporate link found [Confirmed] — cisa.gov/news-events/ics-medical-advisories/icsma-25-030-01

Shared base alert

70:B3:D5 is IEEE-administered with roughly 4,092 registrants beneath it; Contec Americas Inc. owns only its 7 listed /36 sub-blocks, never the bare 70:B3:D5 prefix [Confirmed] — the IEEE MA-S registry

Registration dates

Unknown — IEEE publishes no assignment/registration dates for MAC/OUI prefixes; no third-party date is reported here [Confirmed] — the IEEE MA-S registry, the IEEE MA-L registry