Espressif Systems (Singapore) Pte. Ltd — 5 prefixes (MA-L)

A MAC address beginning with 20:D5:C2, B8:BB:11, 6C:3D:D8, C8:DA:29, or D0:9A:AF belongs to Espressif Systems (Singapore) Pte. Ltd, and typically identifies an ESP8266/ESP32-family Wi-Fi/Bluetooth microcontroller module embedded in an IoT, smart-home, or DIY electronics device.

This registrant is a distinct IEEE registrant from "Espressif Inc." (the Shanghai/BVI-addressed entity holding roughly 315 prefixes, already covered by the separate DONE entry vendor-espressif). The two prefix sets are not interchangeable and should not be merged.

Company substance goes beyond a bare OUI registration. Singapore's ACRA-derived company registry shows a live, matching entity: UEN 202004510Z, incorporated 7 February 2020, registered at the exact same address as the IEEE filing, with a stated activity of IT consultancy and electronics R&D. Espressif's own corporate site lists Singapore among its office locations, corroborating this as a genuine Espressif Systems subsidiary rather than a coincidentally-named company.

No specific device model has been publicly tied to any of these five prefixes individually; third-party lookup tools label them only generically as "Espressif." The device-class identification above is therefore an inference from corporate identity and the parent company's product line, not a confirmed per-prefix fact.

None of the five prefixes is a shared IEEE-administered base like 70:B3:D5 or 8C:1F:64; each is a standard direct MA-L assignment to this single registrant, so no sub-allocation caveat applies.

No malware, abuse, or CVE association was found tied to this specific registrant or its five prefixes as of an August 2026 search. Separately, Tarlogic Security's March 2025 research into undocumented ESP32 Bluetooth HCI commands (tracked as CVE-2025-27840, initially reported as a "backdoor") concerns the ESP32 chip platform broadly, not this Singapore OUI slice specifically; Espressif characterized the commands as internal debug functionality, and later coverage walked back the backdoor framing.

IEEE's the IEEE MA-L registry publishes no assignment-date field for any registrant. Any "date registered" shown by third-party tools such as maclookup.app for these prefixes is that tool's own crawl/index timestamp, not an IEEE fact, and must not be presented as an IEEE registration date.

IEEE assignment

5 prefixes → Espressif Systems (Singapore) Pte. Ltd, registered Singapore, SG [Confirmed] — the IEEE MA-L registry 20D5C2, the IEEE MA-L registry B8BB11, the IEEE MA-L registry 6C3DD8, the IEEE MA-L registry C8DA29, the IEEE MA-L registry D09AAF

Registry / block size

MA-L (24-bit OUI); 5 IEEE prefixes for this registrant [Confirmed] — the IEEE MA-L registry

HQ / country

1 Fusionopolis View #07-02 Eclipse, Singapore 138577, SG (identical across all 5 registry rows; matches ACRA registered address) [Confirmed] — the IEEE MA-L registry 20D5C2, https://opengovsg.com/corporate/202004510Z

Company status

active — ACRA UEN 202004510Z, Private Company Limited by Shares, incorporated 7 Feb 2020 [Confirmed] — https://www.sgpbusiness.com/company/Espressif-Systems-Singapore-Pte-Ltd, https://opengovsg.com/corporate/202004510Z

Device types

ESP8266/ESP32-family Wi-Fi/Bluetooth microcontroller SoCs/modules for IoT, smart-home, and DIY electronics — inferred from parent-company product line, not per-prefix confirmed [Likely] — https://maclookup.app/macaddress/20d5c2, https://www.espressif.com/en/company/about-espressif

Notable products

ESP8266, ESP32 (parent-company product line) [Likely] — https://www.espressif.com/en/company/about-espressif

Registration date

no date field published by IEEE for OUI/MAC assignments; not attributable [Unknown] — the IEEE MA-L registry, https://maclookup.app/macaddress/20d5c2

Distinct registrant note

"Espressif Systems (Singapore) Pte. Ltd" (this entry, 5 prefixes) is a separate IEEE registrant from "Espressif Inc." (~315 prefixes, separate DONE entry) [Confirmed] — the IEEE MA-L registry, /mac/vendor/espressif/

Shared-base check

none of the 5 prefixes is a shared IEEE-administered base (e.g. 70:B3:D5, 8C:1F:64) [Confirmed] — the IEEE MA-L registry 20D5C2, the IEEE MA-L registry B8BB11, the IEEE MA-L registry 6C3DD8, the IEEE MA-L registry C8DA29, the IEEE MA-L registry D09AAF

Security history

no CVE/malware association found specific to this registrant as of an August 2026 search; broader ESP32-platform Bluetooth HCI-command research (CVE-2025-27840, March 2025) is background context about the chip family generally, not this registrant [Confirmed (research exists); Unknown (any device on these 5 prefixes implicated)] — https://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/, https://www.tarlogic.com/news/hidden-feature-esp32-chip-infect-ot-devices/, https://circuitdigest.com/news/the-truth-behind-alleged-backdoor-in-esp32-bluetooth-stack

Related vendors

Espressif Inc. (separate registrant, ~315 prefixes, distinct entry) [Confirmed] — /mac/vendor/espressif/

Analyst note

a MAC on one of these 5 prefixes identifies genuine Espressif Systems Singapore-registered hardware; do not conflate with the separate Espressif Inc. prefix set when reconciling counts or claims [Confirmed] — the IEEE MA-L registry