DongGuan Siyoto Electronics Co., Ltd — 4 prefixes (3× MA-L, 1× MA-M)

A MAC address beginning with 00:B4:F5, 4C:FE:2E, 28:FE:65, or F0:41:C8:1 (within the /28 sub-block F0:41:C8:1/28) belongs to a device made by DongGuan Siyoto Electronics Co., Ltd, a Guangdong, China-based OEM/ODM manufacturer — typically Bluetooth earbuds, headsets, smart speakers, or smart wearables such as bands, watches, and glasses. Note that the wider F0:41:C8 /24 is IEEE Registration Authority space shared among 15 unrelated registrants — a bare F0:41:C8 MAC outside the F0:41:C8:1/28 sub-block is NOT attributable to Siyoto.

Siyoto holds four IEEE OUI assignments under this single organization name and address: three MA-L (24-bit) blocks, and one MA-M (28-bit) sub-allocation (F0:41:C8:1/28) beneath the IEEE-held F0:41:C8 /24, all registered to Hecheng Industrial District, QiaoTou Town, DongGuan City, Guangdong. Consolidating all four prefixes into one vendor entry avoids near-duplicate per-prefix pages for a single manufacturer.

The company's own site describes an ISO9001-certified OEM/ODM founded in 2006, operating a roughly 5,000-square-meter facility, producing earphones and headphones, smart speakers, cables and connectors, and smart wearables. Independent B2B directories — made-in-china.com, Global Sources, and MFG.com — corroborate it as an active Bluetooth/TWS-earbud manufacturer and exporter, with MFG.com dating its contract-manufacturing activity to 2010.

Search-indexed device trackers (device.report, fcc.report) list named models such as BW04 and BWD021 attributed to Siyoto, consistent with its audio-wearables focus; direct page fetches of both sites failed (404/403), so this corroboration is search-snippet-level only, not independently page-verified. IEEE's public OUI/MAC registries carry no assignment-date field, so no registration date is recorded for any of the four prefixes.

IEEE assignments

4 total → DongGuan Siyoto Electronics Co., Ltd, registered Guangdong, CN [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry

Registry / block sizes

MA-L (24-bit, 3 blocks: 00:B4:F5, 4C:FE:2E, 28:FE:65); MA-M (28-bit, 1 block: F0:41:C8:1/28 — a sub-allocation beneath the IEEE Registration Authority's F0:41:C8 /24, which is shared among 15 unrelated registrants)

[Confirmed] — the IEEE MA-L registry (lines ~1840/8701/9651, and line 10031 for the IEEE base), the IEEE MA-M registry (line 612)

HQ / country

Hecheng Industrial District, QiaoTou Town, DongGuan City, Guangdong CN 523520 [Confirmed] — IEEE the IEEE MA-L registry / the IEEE MA-M registry

Company status

active (operating website and current B2B listings; no formal registry status field) [Likely] — siyoto.com, made-in-china.com listing

Device types

Bluetooth/TWS earbuds and headsets, smart speakers, cables/connectors, smart wearables (smartbands, smartwatches, smart glasses) [Confirmed] — siyoto.com

Notable products

BW04, BWD021 (named device models) [Likely] — device.report, fcc.report (search-snippet only; direct fetch blocked 404/403)

Founded / certification

founded 2006, ISO9001-certified, ~5,000 sqm facility [Confirmed] — siyoto.com

Third-party corroboration

made-in-china.com, Global Sources, MFG.com (contract manufacturer since 2010) [Confirmed] — made-in-china.com, globalsources.com, mfg.com

Registration dates

Unknown — IEEE the IEEE MA-L registry/mam.csv publish no assignment-date field; any third-party "date registered" is a database artifact, not an IEEE fact [Confirmed] — IEEE OUI registry policy (no dates published for MAC assignments)

Security context

no CVEs, advisories, or notable incidents found in this light pass; consumer Bluetooth audio/wearables is a low-security-relevance device category [Unknown] — no findings to cite

Related vendors

none identified [Unknown]

Analyst note

identifiable operating company with product/device context and 4 OUI assignments (3× MA-L + 1× MA-M) under one registrant name/address — passes the abstain-on-shells bar; not a bare single-OUI shell registration.