NEGATIVE FINDING: there is no IEEE MA-L, MA-M, or MA-S registrant under the name "Sigma Designs" in the IEEE registry as of 2026-06-11 — a grep of oui.csv, mam.csv, and oui36.csv for "sigma designs" returns zero rows (the only "Sigma…" hits are unrelated firms such as Sigmastar, SigmaTel, and Sigma Corporation). So the prefixes array stays empty by design. Sigma Designs was a US fabless semiconductor maker (Fremont, California), best known as the primary Z-Wave chipset supplier and for media-processor and set-top-box SoCs, that was wound down after 2018. The corporate history is decisive: Silicon Labs completed its acquisition of Sigma Designs' Z-Wave business for $240 million in an all-cash deal on 2018-04-18 (including roughly 100 employees); separately, V-Silicon acquired Sigma's Smart TV / set-top-box (media) business and IP for ~$5.3 million (closed late March 2018), and home-networking (G.hn) assets went to ISSI. Because Sigma never holds a current brand OUI, its silicon now surfaces under successor or ODM identifiers: newer Z-Wave silicon carries Silicon Labs OUIs, and media/STB and home-networking parts carry V-Silicon, the integrator, or the ODM's OUI. For triage, treat any device once built on Sigma silicon as legacy smart-home or set-top-box hardware whose MAC most likely resolves to Silicon Labs or an ODM, not to "Sigma Designs."
- IEEE assignment
- NONE under "Sigma Designs" — zero MA-L/MA-M/MA-S rows for "sigma designs" in the IEEE registry as of 2026-06-11 (oui.csv/mam.csv/oui36.csv); unrelated "Sigma…" firms (Sigmastar, SigmaTel, Sigma Corp) are NOT this company [Confirmed — negative finding] — IEEE registry
- Likely OUI source
- successor / ODM identifiers — newer Z-Wave silicon → Silicon Labs OUIs; media/STB and home-networking parts → the integrator's or ODM's OUI [Likely] — IEEE registry + corporate history
- Registry / block size
- no Sigma-Designs-named block exists [Confirmed — negative finding] — IEEE registry
- HQ / country
- 47467 Fremont Blvd, Fremont, CA 94538, US (some offices in Milpitas) [Likely] — corporate sources
- Company status
- defunct / wound down; Silicon Labs completed acquisition of the Z-Wave business for $240M all-cash 2018-04-18 (~100 employees); V-Silicon acquired the Smart TV/STB (media) business + IP for ~$5.3M (closed late March 2018); home-networking (G.hn) to ISSI [Confirmed] — Silicon Labs newsroom; Sigma Designs SEC 8-K (V-Silicon)
- Device types
- Z-Wave smart-home silicon (hubs, sensors, locks, thermostats), media-processor/set-top-box SoCs, home-networking (G.hn) [Confirmed] — en.wikipedia.org/wiki/Sigma_Designs
- Notable products
- Z-Wave 500/700-series silicon (pre-2018), SMP86xx/88xx media processors
- Verified prefix sample
- none (no Sigma Designs registrant) [Confirmed — negative finding] — IEEE registry
- Special note
- NEGATIVE FINDING — Sigma Designs owns no current brand OUI; its silicon surfaces under successor/ODM OUIs (Silicon Labs for Z-Wave; integrator/ODM for media/STB). The IEEE registry publishes no assignment dates, so none is stated here. [Confirmed]
- Related vendors
- Silicon Labs (acquired Z-Wave 2018), V-Silicon (acquired media/STB business + IP 2018), ISSI (G.hn)
- Analyst note
- A device once built on Sigma silicon is legacy smart-home or set-top-box hardware; its MAC most likely resolves to Silicon Labs or an ODM, not to "Sigma Designs."