A-First Technology Co., Ltd. — 00:15:66 (MA-L)

A-First Technology Co., Ltd. is a Taiwanese manufacturer of fiber-optic access equipment, holding a single IEEE MA-L block, 00:15:66, registered at 5F, No. 111-2, Shin-Teh Rd., San-Chung City, Taipei Hsien, TW 241. Unlike many single-OUI registrants that turn out to be shell filings with no discoverable business behind them, A-First's own corporate site (a-first.com.tw, now defunct but archived more than fifty times on the Wayback Machine between 2002 and 2022) describes a company founded in 1998 that built point-to-point media converters, European-style digital loop carrier (DLC) systems, and EPON (Ethernet Passive Optical Network) equipment under technology licensed from Taiwan's Industrial Technology Research Institute in 2005. A Taiwan Trade B2B directory listing under the same name provides weak secondary corroboration of the company's continued existence. The device types line up plausibly with a manufacturer needing an embedded Ethernet MAC OUI for network interfaces in its own access-network hardware. IEEE's registry carries no assignment date for this or any OUI; a third-party aggregator's "First Seen 2005-08-07" figure is that tool's own database-crawl timestamp, not an IEEE fact, and is deliberately not recorded as a registration date here.

IEEE assignment

00:15:66 → A-First Technology Co., Ltd. [Confirmed] — the IEEE MA-L registry, cross-confirmed the Wireshark manufacturer database, https://standards-oui.ieee.org/oui/oui.csv

Registry / block size

MA-L (24-bit OUI); single block — no MA-M or MA-S sub-block found for this organization [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry (full-registry name search)

Registered address / country

5F, No. 111-2, Shin-Teh Rd., San-Chung City, Taipei Hsien, TW 241 [Confirmed] — the IEEE MA-L registry

Date registered

Unknown — IEEE's public OUI data publishes no assignment/registration date. maclookup.app shows "First Seen: 2005-08-07 / Last Modified: 2015-11-17" for this vendor, but those are the aggregator's own crawl/index timestamps, not an IEEE fact, and are not recorded as a registration date.

[Confirmed as Unknown] — https://maclookup.app/search/result?q=A+First+Technology

Company status

Likely inactive/defunct — the corporate domain a-first.com.tw no longer resolves; last confirmed Wayback capture activity spans 2002–2022 with no more recent snapshots found [Likely] — http://web.archive.org/cdx/search/cdx?url=a-first.com.tw&matchType=domain

Device types / products

fiber-optic access equipment, point-to-point media converters, European-style digital loop carrier (DLC) systems, EPON (Ethernet Passive Optical Network) equipment (ITRI-licensed 2005) [Likely] — http://web.archive.org/web/20120615222032/http://www.a-first.com.tw/english/about.php

Company substance verdict

real, identifiable Taiwanese telecom-equipment manufacturer founded 1998 (首特科技股份有限公司), not a bare single-OUI shell registration — corroborated by 50+ archived site captures spanning two decades and a Taiwan Trade directory listing

[Confirmed substantive] — Wayback CDX index, https://www.taiwantrade.com/suppliers/detail.html?companyid=158825

Verification note

a generic web-search summary produced one hallucinated/incorrect claim attributing 00:15:66 to Xiamen Yealink Network Technology (likely confused with adjacent OUI 00:15:65); rejected in favor of the two agreeing IEEE-derived sources (the IEEE MA-L registry, Wireshark the Wireshark manufacturer database)

[Confirmed rejection] — internal cross-check