Yamaha — 4 prefixes across 2 companies (MA-L)

A MAC address beginning AC:44:F2, 00:A0:DE, or F4:D5:80 belongs to Yamaha Corporation, the Hamamatsu-based music and audio company — most often an RTX- or NVR-series router, an FWX120 firewall, or an SWX/WLX-series switch or Wi-Fi access point from its enterprise networking division. A MAC beginning 00:04:C6 belongs instead to the separate company Yamaha Motor Co., Ltd.; no source ties that specific block to a named product line, so its device class is Unknown.

Yamaha Motor Co., Ltd. demerged from Yamaha Corporation in 1955 to focus on motorcycles and engines, and the two have been legally and financially independent ever since — sharing a name and Hamamatsu-area origin but not ownership or registrations. Yamaha Corporation kept the music, professional-audio, and (later) networking businesses; Yamaha Motor grew into a global maker of motorcycles, marine engines, ATVs, and industrial robots. Each company registers its own IEEE OUI blocks separately.

Yamaha Corporation's enterprise networking division — branded Yamaha Network Products — sells RTX-series VPN/site-to-site routers, NVR-series VoIP routers, the FWX120 firewall/UTM, SWX-series switches, and WLX-series Wi-Fi access points to businesses, schools, and healthcare and retail sites, managed through its Yamaha Network Organizer cloud tool. A second switch line, SWP/SWR, targets professional-audio installs running Dante digital-audio-over-Ethernet.

Yamaha Corporation also ships MusicCast, a Wi-Fi/Bluetooth multi-room audio platform built into AV receivers and speakers, though no source ties a specific block to a MusicCast device by name. For the Yamaha Motor block (00:04:C6), the registered address reads "Information System Division, Japan" — consistent with an internal corporate-IT registration rather than a named consumer product — but nothing found ties it to a specific robotics, marine, or vehicle line.

IEEE's public OUI registry publishes no assignment date for any of the four blocks. Yamaha's own router-support FAQ states 00:A0:DE has been used in firmware since March 1995, AC:44:F2 since February 2017, and F4:D5:80 since July 2023 — a first-party "in production use" claim, not an IEEE date. A third-party lookup site separately lists 00:A0:DE as "registered 22 April 1998," a database artifact conflicting with Yamaha's own figure by three years.

Yamaha's networking gear carries one confirmed vulnerability: CVE-2020-5548, an unauthenticated denial-of-service flaw (CVSS 7.5) affecting NVR700W/510/500, RTX810/830/1200/1210/3500/5000, and the FWX120, since fixed in later firmware. Yamaha's own documentation and a third-party aggregator both describe RTX/NVR devices shipping from the factory with no administrator password set, requiring the operator to configure one after first boot.

As of an August 2026 search, no malware or botnet campaign specifically targeting Yamaha network gear was found, and no additional CVE was confirmed for the FWX120, the SWX/SWP/SWR switch lines, or Yamaha Motor's networked products.

IEEE assignment

4 MA-L (24-bit) blocks, exclusive full /24s (not shared/sub-allocated IEEE bases) → "YAMAHA CORPORATION" (AC44F2, 00A0DE, F4D580) and "YAMAHA MOTOR CO.,LTD" (0004C6) [Confirmed] — the IEEE MA-L registry AC44F2, 00A0DE, F4D580, 0004C6

Registry / block size

MA-L only; a case-insensitive search for "yamaha" returns zero rows in the IEEE MA-M registry and the IEEE MA-S registry, so neither entity holds an MA-M or MA-S assignment [Confirmed] — the IEEE MA-M registry, the IEEE MA-S registry

HQ / country

Yamaha Corporation — 10-1 Nakazawa-cho, Naka-ku, Hamamatsu, Shizuoka, JP 430-8650 (all 3 blocks); Yamaha Motor Co., Ltd. — "Information System Division, Japan," JP 438-8501 (00:04:C6) [Confirmed] — the IEEE MA-L registry AC44F2, 00A0DE, F4D580, 0004C6

Company status

both active — Yamaha Corporation (musical instruments, pro/consumer audio, enterprise networking) and Yamaha Motor Co., Ltd. (motorcycles, marine, robotics), independently operating public companies [Confirmed] — usa.yamaha.com, network.yamaha.com, global.yamaha-motor.com/about/business/sm-ir/

Device types

Yamaha Corporation — RTX-series routers, NVR-series VoIP routers, FWX120 firewall, SWX-series switches, WLX-series Wi-Fi access points, SWP/SWR Dante pro-audio switches [Confirmed] — network.yamaha.com, usa.yamaha.com/products/proaudio/network_switches/index.html; MusicCast consumer AV [Likely] — usa.yamaha.com/products/audio_visual/musiccast/index.html; Yamaha Motor Co. — device class for the 00:04:C6 block itself is Unknown [Unknown]

Notable products

RTX810/830/840/1200/1210/1220/1300/3500/3510/5000, NVR500/510/700W, FWX120, SWX-series, WLX-series, SWP1/SWP2, SWR2311P-10G/SWR2310, MusicCast [Confirmed] — network.yamaha.com, usa.yamaha.com/products/proaudio/network_switches/swp1/features.html, usa.yamaha.com/products/proaudio/network_switches/swr2311p/features.html

Verified sample prefixes

AC:44:F2, 00:A0:DE, F4:D5:80 (YAMAHA CORPORATION); 00:04:C6 (YAMAHA MOTOR CO.,LTD) [Confirmed] — the IEEE MA-L registry AC44F2, 00A0DE, F4D580, 0004C6

Historic / date note

IEEE publishes no assignment date for any of the 4 blocks. Yamaha's own router-support FAQ states production firmware use since March 1995 (00:A0:DE), February 2017 (AC:44:F2), and July 2023 (F4:D5:80) — a vendor "in service since" statement, not an IEEE registration date [Likely, machine-translated source not independently re-verified verbatim] — rtpro.yamaha.co.jp/RT/FAQ/TOPIC/macaddress.html. A third-party aggregator separately lists 00:A0:DE as "registered 22 April 1998" — a database artifact that conflicts with Yamaha's own figure by three years and is recorded here only to illustrate the discrepancy, not as fact

[Confirmed as an illustrative conflict] — maclookup.app/macaddress/00a0de

Special note

some third-party MAC databases label AC:44:F2 as "Revolabs" rather than Yamaha; Yamaha Corporation acquired Revolabs, Inc. (wireless conferencing microphones/UC audio) in March 2014, a plausible source of the alternate label, though Yamaha's own FAQ documents AC:44:F2 as also actively used across its RTX/NVR/FWX/SWX firmware [Likely] — usa.yamaha.com/news_events/2014/20140317_yamaha-announces-share-acquisition-full-ownership-revolabs_us-wireless_audio_solutions_provider_us.html, maclookup.app/macaddress/AC44F2

Related vendors

Revolabs, Inc. (acquired by Yamaha Corporation, March 2014; may hold its own separate OUI registrations, not confirmed here) [Likely] — usa.yamaha.com/news_events/2014/20140317_yamaha-announces-share-acquisition-full-ownership-revolabs_us-wireless_audio_solutions_provider_us.html

Security

CVE-2020-5548 (CVSS v3.1 7.5, unauthenticated remote DoS, availability-only impact) affects then-current firmware on NVR700W/510/500, RTX810/830/1200/1210/3500/5000, and FWX120 [Confirmed] — nvd.nist.gov/vuln/detail/CVE-2020-5548, jvn.jp/en/jp/JVN38732359/index.html; RTX/NVR devices ship from the factory with no administrator password set [Likely, one source page migrated/not re-fetched verbatim] — router-reset.com/default-password-ip-list/Yamaha; no malware/botnet association or additional CVE confirmed beyond the one above, as of an August 2026 search

[Unknown] — cvedetails.com/vulnerability-list/vendor_id-308/Yamaha.html

Analyst note

treat "Yamaha" as two companies, not one — AC:44:F2, 00:A0:DE, and F4:D5:80 identify Yamaha Corporation networking/audio hardware; 00:04:C6 identifies the separately-registered Yamaha Motor Co., Ltd., whose device class is not established from available sources. Do not infer a router/switch identity for 00:04:C6, and do not attribute Yamaha Motor's vehicles, marine engines, or robotics to the other three blocks. [Confirmed re: the two registrants being distinct]