GN Hearing A/S is a Danish manufacturer of medical-grade Bluetooth hearing aids, registered to IEEE under three MA-L (24-bit OUI) blocks — CC:89:6C, A8:A9:13, and 98:42:AB — all carrying the same registry address at Lautrupbjerg 7, Ballerup, Denmark. The company is a subsidiary of GN Store Nord A/S (Nasdaq Copenhagen: GN.CO) and ships hearing aids under the ReSound, Beltone, Interton, and Danavox brands. These are wearable Class-II medical devices, not IT infrastructure: they connect to smartphones over Bluetooth Low Energy and Bluetooth LE Audio, and support Auracast broadcast audio for public-venue streaming. The practical consequence for network operators is that a MAC from one of these blocks almost always indicates a nearby BLE hearing aid worn by a person — staff, patient, or visitor — rather than fixed equipment, so the relevant posture is BLE-proximity / BYOD medical-device policy rather than an exploit path. No CVEs or public security advisories specific to GN Hearing or ReSound devices were found as of June 2026; the major 2025 Airoha Bluetooth-SoC vulnerabilities (CVE-2025-20700/20701/20702) name many earbud brands but explicitly do not name hearing aids, and GN devices are not documented as Airoha-based. A live current-events caveat: on 2026-03-16 GN Store Nord announced an agreement to sell the entire hearing business to Amplifon S.p.A. for ~DKK 17B (~$2.6B USD), pending regulatory approval and expected to close by end of 2026 — after which these OUI registrations are expected to pass to Amplifon. As with all OUI work, no registration date is recorded: IEEE publishes none, and the "dates" shown on third-party lookup tools are database scrape artifacts, not IEEE facts.
- IEEE assignment
- 3 prefixes → GN Hearing A/S, registered Lautrupbjerg 7, Ballerup, Denmark [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv lines 904, 6841, 7586)
- Registry / block size
- MA-L (24-bit OUI); 3 IEEE prefixes. No MA-M (mam.csv) or MA-S (oui36.csv) entries found. [Confirmed] — IEEE MA-L. NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" on third-party tools (maclookup.app shows 2021-04-24, 2024-04-25, 2025-10-15) is a database artifact, not an IEEE fact.
- HQ / country
- Lautrupbjerg 7, Ballerup, DK 2750 (registry address; HQ also Ballerup, Denmark) [Confirmed] — IEEE MA-L, https://www.globaldata.com/company-profile/gn-hearing-as/
- Company status
- active; subsidiary of GN Store Nord A/S (Nasdaq Copenhagen: GN.CO) [Confirmed] — https://www.gnhearing.com/en/, https://www.gn.com
- Device types
- medical-grade Bluetooth hearing aids and wireless accessories (Class-II medical devices) [Confirmed] — https://www.gnhearing.com/en/products/hearing-aids, https://www.resound.com/en-us/hearing-aids/bluetooth-hearing-aids
- Notable products / brands
- ReSound, Beltone, Interton, Danavox [Confirmed] — https://www.gnhearing.com/en/, https://audioxpress.com/news/gn-group-sells-hearing-business-to-worlds-largest-retailer-of-hearing-aids
- Verified prefixes (all MA-L, GN Hearing A/S)
- CC:89:6C, A8:A9:13, 98:42:AB [Confirmed] — IEEE MA-L (oui.csv lines 904, 6841, 7586), https://maclookup.app/vendors/gn-hearing-a-s
- Connectivity
- Bluetooth Low Energy (BLE) and Bluetooth LE Audio (Bluetooth 5.3+ on paired device); Auracast broadcast audio; ReSound companion app pairs over Bluetooth and (per privacy policy) collects device-unique ID, IP address, Bluetooth name and Bluetooth MAC address [Confirmed] — https://www.resound.com/en-us/privacy, https://www.gn.com/newsroom/news/2026/February/GN-unveils-innovative-hearing-aids-and-fitting-solutions
- Security context
- No confirmed CVEs or advisories specific to GN Hearing / ReSound found as of June 2026. The 2025 Airoha BLE-SoC vulnerabilities (CVE-2025-20700/20701/20702, CVSS 8.8–9.6, RACE protocol) name Sony/Bose/JBL/Jabra/Marshall etc.; researchers explicitly stated they did not check hearing aids and have no verified info on hearing aids being affected. GN devices use their own BLE stack and are not documented as Airoha-based. [Confirmed] — https://insinuator.net/2025/06/airoha-bluetooth-security-vulnerabilities/, https://nvd.nist.gov/vuln/detail/cve-2025-20700
- Notable context (pending acquisition)
- on 2026-03-16 GN Store Nord agreed to sell the entire hearing business (ReSound, Beltone, Interton, Danavox; ~5,500 employees) to Amplifon S.p.A. for ~DKK 17B (~$2.6B USD); pending regulatory approval, expected to close end of 2026. Post-close the brands and OUI registrations are expected to pass to Amplifon; GN Group retains Enterprise (Jabra) and Gaming (SteelSeries). [Confirmed] — https://www.gn.com/newsroom/announcement?id=3256006, https://hearingreview.com/inside-hearing/industry-news/amplifon-to-acquire-gn-hearing-in-2-6-billion-deal
- Analyst note
- a MAC from these blocks almost always identifies a worn BLE hearing aid (person), not infrastructure; the relevant enterprise concern is BLE proximity / BYOD medical-device policy, not a known exploit. Don't rely on OUI alone to assert device identity if a third-party privacy MAC is in play.