TECOM Co., Ltd. — 3 prefixes (MA-L)

A MAC address beginning with 00:03:C9, 00:16:38, or 00:19:15 belongs to TECOM Co., Ltd. (東訊股份有限公司), a Taiwanese business-communications manufacturer — most plausibly an enterprise VoIP/PBX telephone or business-infrastructure device rather than a consumer product, given the ~2000s registration era of these specific blocks.

TECOM was founded in 1980 in Taiwan's Hsinchu Science-Based Industrial Park and has traded on the Taiwan Stock Exchange since November 1991. It operates as an affiliate of the TECO Group (Teco Electric & Machinery, founded 1956) and describes itself as Taiwan's top business-communications maker, with a self-reported 60%+ share of the domestic SME market. The company holds three separate IEEE OUI assignments under its own name, not a single shell registration.

All three blocks — 00:03:C9, 00:16:38, and 00:19:15 — are dedicated MA-L (/24) assignments registered directly to TECOM, not slices of a shared IEEE base. No additional MA-M or MA-S sub-allocations appear under TECOM's name in the IEEE MA-M registry or the IEEE MA-S registry registries. IEEE's own the IEEE MA-L registry publishes no registration date for any of the three; third-party sites showing dates around 2000-2006 are database artifacts, not IEEE facts.

A common mix-up: two unrelated companies with similar-sounding names, "Stecomp" and "Intecom," hold sub-allocations under the shared IEEE base 70:B3:D5 — neither is affiliated with TECOM Co., Ltd. of Taiwan. TECOM's own three blocks are independently registered, not shared, so this vendor entry applies to those prefixes without a shared-base caveat. TECOM is also unrelated to Dubai's similarly-named "TECOM Group" free-zone authority.

IEEE assignment

3 prefixes → TECOM Co., Ltd., registered Hsinchu, Taiwan [Confirmed] — the IEEE MA-L registry 001915, 001638, 0003C9

Registry / block size

MA-L (24-bit OUI) × 3 independently registered blocks (~16.7M addresses each); no MA-M or MA-S sub-allocations found under TECOM's name [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

HQ / country

23 R&D Road 2, Science-Based Industrial Park, Hsinchu, Taiwan 300, TW (registry address matches TECOM's own stated HQ; the 0003C9 row uses a shorter, older address format — same location) [Confirmed] — the IEEE MA-L registry 001915, 001638, 0003C9; tecom.com.tw/en/about-tecom/company-profile/

Company status

active — publicly traded on the Taiwan Stock Exchange since November 1991, founded 1980 [Confirmed] — tecom.com.tw/en/about-tecom/company-profile/, en.wikipedia.org/wiki/Tecom

Device types

enterprise IP telephone systems/PBX, mobile routers, VoIP gateways, G-PON/GE-PON optical networking equipment, network cameras/intercoms, industrial IoT sensors — TECOM's current stated product lines [Confirmed] — tecom.com.tw/en/about-tecom/company-profile/

Notable products

business telephone systems / digital PBX switchboards — self-described "Taiwan's No.1 Business Communications Maker" with 60%+ domestic SME market share (self-reported, not independently audited) [Confirmed] — tecom.com.tw/en/company-profile-2/

Verified sample prefixes (all MA-L, TECOM Co., Ltd.)

00:03:C9, 00:16:38, 00:19:15 [Confirmed] — the IEEE MA-L registry, the Wireshark manufacturer database

Parent group

affiliate of Taiwan's TECO Group (Teco Electric & Machinery / "Tung Yuan Electric," founded 1956) [Confirmed] — tecom.com.tw/en/about-tecom/company-profile/, en.wikipedia.org/wiki/Tecom

No-IEEE-date note

the IEEE MA-L registry publishes no assignment/registration date for any of the 3 blocks; maclookup.app's third-party dates (2000-11-09, 2005-10-29, 2006-07-19) are database artifacts, not IEEE facts [Confirmed] — the IEEE MA-L registry; maclookup.app/vendors/tecom-co-ltd

Security note

no CVE mentioning TECOM is recorded in the NVD as of an August 2026 keyword search; a site-restricted cisa.gov/cve.mitre.org search returned no TECOM-specific hits either — a scoped negative, not a security guarantee [Confirmed] — services.nvd.nist.gov/rest/json/cves/2.0?keywordSearch=TECOM

Data-quality trap

"Stecomp" (70:B3:D5:EE:0/36) and "Intecom" (70:B3:D5:CC:5/36) are unrelated companies sub-allocated under the shared IEEE base 70:B3:D5 — not TECOM Co., Ltd. and not part of its 3 dedicated blocks [Confirmed] — the IEEE MA-S registry

Related vendors

WuHan TECOM Co. Ltd. (R&D/manufacturing entity, Wuhan, China) — named only in aggregated web-search results; not independently fetch-verified, and no separate OUI assignment under this name appears in the registry [Likely] — unverified beyond aggregated search results

Analyst note

A TECOM Co., Ltd. OUI most plausibly indicates an enterprise VoIP/PBX phone or business-communications infrastructure asset, given the ~2000s registration era of these three blocks (per third-party, non-IEEE dates) predating TECOM's newer smart-building/IoT lines; no CVE is recorded as of August 2026, which reflects an absence of indexed disclosure, not a verified secure posture

[Likely] — tecom.com.tw/en/about-tecom/company-profile/, services.nvd.nist.gov/rest/json/cves/2.0