Widex A/S — 2 prefixes (MA-L)

A MAC address starting with 40:4A:D4 or 84:D4:C8 belongs to Widex A/S, a Danish hearing-aid manufacturer, and is typically seen on hearing-aid hardware or its Bluetooth-enabled companion accessories such as smartphone apps and TV/audio streamers.

Widex A/S was founded in 1956 by the Tøpholm and Westermann families and remained family-controlled for decades. Headquartered in Lynge, in Allerød Municipality, Denmark — the same address recorded on both IEEE OUI assignments — the company grew to roughly 3,800 employees selling hearing aids in about 100 countries, ranking as the world's sixth-largest hearing-aid maker before its 2019 merger.

Since March 2019, Widex has operated as part of WS Audiology A/S, formed by the merger of Sivantos and Widex, which remains its current corporate parent and brand owner.

Widex's product category (hearing aids and their companion Bluetooth/BLE accessories) is confirmed at the vendor level through the FDA's GUDID medical-device registry, which lists Widex A/S as manufacturer of record for marketed devices such as the CLEAR440 BTE. No source independently ties either specific prefix, 40:4A:D4 or 84:D4:C8, to a named product's radio chipset, so that mapping is a reasonable inference from Widex's product line rather than a confirmed fact for these exact blocks.

No CVE, security advisory, botnet association, or default-credential report is recorded against Widex hardware, firmware, or either prefix, as of an August 2026 search of NVD, CVE.org, and general web sources. Separately, WS Audiology — the corporate parent, headquartered in the same town — disclosed a ransomware attack first reported around July 2024, attributed to the BlackSuit group, affecting patient and employee data across several country subsidiaries; this is corporate IT history, not a device vulnerability.

Device class

Hearing aids (BTE/RIC/ITE) [Confirmed via FDA GUDID device-category listing] — accessgudid.nlm.nih.gov

Also seen on

Bluetooth/BLE companion apps and TV/audio streamers for Widex hearing aids [Likely, inferred from product line] — widex.com

Company type

Independent hearing-aid manufacturer, now a WS Audiology brand [Confirmed] — en.wikipedia.org/wiki/WS_Audiology

Registered address

Nymøllevej 6, Lynge, Allerød, DK-3540, Denmark (identical on both OUI blocks) [Confirmed] — the IEEE MA-L registry

Security history (device)

No CVE or advisory found as of an August 2026 search [Unknown, sourced negative] — NVD, CVE.org

IEEE assignment

2 prefixes → Widex A/S, registered Lynge, Denmark [Confirmed] — the IEEE MA-L registry (assignments 404AD4, 84D4C8)

Registry / block size

MA-L (24-bit OUI); 2 dedicated IEEE prefixes, not a shared/sub-allocated base [Confirmed] — the IEEE MA-L registry

HQ / country

Nymøllevej 6, Lynge, Allerød, DK-3540, Denmark [Confirmed] — the IEEE MA-L registry

Company status

active, operating as a brand of WS Audiology A/S since the 2019 Sivantos–Widex merger [Confirmed] — https://en.wikipedia.org/wiki/WS_Audiology

Device types

hearing aids (BTE/RIC/ITE) and Bluetooth/BLE companion accessories [Confirmed] — https://accessgudid.nlm.nih.gov/devices/05706069581959

Notable products

Widex CLEAR440 BTE (FDA GUDID listing) [Confirmed] — https://accessgudid.nlm.nih.gov/devices/05706069581959

Verified sample prefixes (both MA-L, Widex A/S)

40:4A:D4, 84:D4:C8 [Confirmed] — the IEEE MA-L registry

Registration date

Unknown — IEEE's public OUI data publishes no assignment/registration date; third-party "registered on" dates shown by mirror sites are database artifacts, not IEEE facts [Unknown] — the IEEE MA-L registry

Related vendors

WS Audiology A/S (current corporate parent, formed from the 2019 Sivantos–Widex merger) [Confirmed] — https://en.wikipedia.org/wiki/WS_Audiology

Special note

WS Audiology A/S (Widex's parent since 2019, same HQ town of Lynge) disclosed a ransomware attack first reported around July 2024, attributed to the BlackSuit group, affecting patient/employee data in several country subsidiaries — corporate IT incident history, not a vulnerability in Widex-branded hearing-aid hardware or firmware itself. [Likely — corporate breach confirmed by two independent trackers; exact scope/entity-naming has some inconsistency between them] — https://breach-hq.com/breaches/ws-audiology/2024-jul, https://www.breachsense.com/breaches/widex-data-breach/

Analyst note

A Widex OUI on a globally-administered address identifies genuine Widex hearing-aid hardware or its companion accessories; the specific prefix-to-product mapping (e.g. which model uses 40:4A:D4 vs 84:D4:C8) is not independently confirmed. [Likely] — https://www.widex.com/en/about-widex/