LEGO System A/S — 3 prefixes (MA-L)

A MAC address beginning 9C:9A:C0, 90:84:2B, or 00:16:53 belongs to LEGO System A/S, the Denmark-based electronics arm of the LEGO Group. The clearest device corroboration is for 90:84:2B, which community sources tie to LEGO Powered Up / Technic Bluetooth Low Energy hubs, including the Technic Hub in set 88009.

LEGO System A/S holds three IEEE MA-L (24-bit OUI) registrations, all listed at Aastvej 1, Billund, Denmark — the LEGO Group's headquarters. One of the three, 00:16:53, is registered under the sub-brand "LEGO System A/S IE Electronics Division." A fourth, related MA-L block (54:73:70, "The LEGO Group") is a separate legal-entity registration and is not counted among this entry's prefixes.

Multiple confirmed OUI assignments plus real-world device corroboration for one prefix are what justify treating LEGO System A/S as a substantive vendor rather than a bare single-OUI shell. Device usage for the other two prefixes (9C:9A:C0 and 00:16:53) was not found and stays Unknown — that is an absence of evidence, not evidence the blocks are unused.

A third-party site shows a "registered 2005" date for 00:16:53; IEEE's own OUI registry publishes no assignment dates, so that figure is a database artifact and is not repeated as fact here. No security advisories or CVEs were found for LEGO's BLE hub firmware; LEGO publishes an open wireless protocol spec, which independent researchers have also reverse-engineered, but that reflects an unobscured protocol, not a known vulnerability.

IEEE assignment

3 prefixes → LEGO System A/S, registered Billund, Denmark (00:16:53 registered under the "LEGO System A/S IE Electronics Division" sub-brand) [Confirmed] — the IEEE MA-L registry (local IEEE MA-L mirror)

Registry / block size

MA-L (24-bit OUI) x3 blocks under LEGO System A/S; a related 4th MA-L block (54:73:70, "The LEGO Group") is a distinct legal-entity registration, not counted here [Confirmed] — the IEEE MA-L registry

HQ / country

Aastvej 1, Billund, DK-7190, Denmark [Confirmed] — the IEEE MA-L registry

Company status

active — LEGO Group is an ongoing, globally known toy manufacturer [Confirmed] — https://www.lego.com

Device types

Bluetooth Low Energy "smart brick" motors/hubs for programmable building sets [Likely, corroborated for one of three prefixes] — https://github.com/orgs/pybricks/discussions/1733, https://lego.github.io/lego-ble-wireless-protocol-docs/

Notable products

LEGO Powered Up / Technic Hub (e.g. Technic Hub set 88009), confirmed on 90:84:2B [Likely] — https://mattzobricks.com/forums/topic/mtc4pu-mattzotraincontroller-for-powered-up, https://github.com/orgs/pybricks/discussions/1733

Verified sample prefixes

9C:9A:C0, 90:84:2B, 00:16:53 — all "LEGO System A/S" (00:16:53 under the IE Electronics Division sub-brand) [Confirmed] — the IEEE MA-L registry

Device usage by prefix

90:84:2B corroborated on Powered Up/Technic BLE hubs; 9C:9A:C0 and 00:16:53 have no device-specific corroboration found — Unknown, not confirmed unused, just not found [Unknown] — no device-specific source located

Registration date caveat

maclookup.app shows a third-party "registered 02 November 2005 / updated 17 November 2015" timestamp for 00:16:53 — a database-scrape artifact, NOT an IEEE-published date; IEEE's OUI registry contains no assignment-date field

[Confirmed] — https://maclookup.app/vendors/lego-system-a-s-ie-electronics-division

Security note

no CVEs or advisories found for LEGO BLE hub firmware; LEGO publishes an open BLE wireless protocol spec and the protocol has been independently reverse-engineered — a documented, non-obscure protocol, not evidence of a vulnerability; stated as "no findings," not "confirmed secure" [Unknown] — https://lego.github.io/lego-ble-wireless-protocol-docs/, https://blog.adafruit.com/2026/03/06/some-lego-smart-brick-ble-reverse-engineering/

Related vendors

The LEGO Group (OUI 54:73:70) — a separate MA-L registration at the same Billund address, a distinct legal entity from LEGO System A/S [Confirmed] — the IEEE MA-L registry

Analyst note

multiple LEGO-branded OUI blocks plus device-level corroboration for one prefix clear the company-substance bar for a consolidated vendor page; the other two prefixes' device context stays Unknown rather than assumed identical.