ABB SPA, ABB SACE DIV. — AC:D3:64 (MA-L)

The OUI prefix AC:D3:64 is registered to "ABB SPA, ABB SACE DIV." at V.LE DELL'INDUSTRIA, 18, Vittuone (MI), IT 20010 — an MA-L (24-bit, large) block covering AC:D3:64:00:00:00 through AC:D3:64:FF:FF:FF. ABB SACE is a named, long-established business line of ABB S.p.A. (the Italian arm of the ABB Group, headquartered in Zurich): the group's low-voltage circuit-breaker and switchgear center of excellence. The "SACE" name traces back to the early-20th-century Società Anonima Costruzioni Elettromeccaniche and has carried ABB's air, molded-case, and solid-state breaker lines for decades. Devices bearing this OUI are almost certainly network-interface (Ethernet) modules on that breaker hardware — most concretely the SACE Emax 2 family and its Ekip Com communication accessories, for which ABB publishes a dedicated "Communication with SACE Emax 2 circuit-breakers" white paper. This is a substantive, product-line-backed registration, not a bare single-OUI shell: ABB is a multinational holding many divisional OUI blocks (ABB Power T&D 00:90:4F, ABB AS Division Automation Products 00:1B:45, ABB AB Cewe-Control 00:0C:62, and others), of which AC:D3:64 is one identifiable member tied to a live catalog. Because these are electrical-distribution/switchgear devices, they are an OT/industrial-control-adjacent asset class intended for segmented networks. As with every MAC OUI, IEEE publishes no registration date for this assignment; any "date registered" on third-party lookup tools is a database artifact, not an IEEE fact.

IEEE assignment

AC:D3:64 → ABB SPA, ABB SACE DIV. [Confirmed] — IEEE MA-L (OUI ACD364), corroborated by maclookup.app and hwaddress.com

Registry / block size

MA-L (24-bit OUI), range AC:D3:64:00:00:00 – AC:D3:64:FF:FF:FF [Confirmed] — IEEE MA-L. NOTE: IEEE's public OUI data publishes NO assignment/registration date (the IEEE MA-L registry columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" on third-party tools is a database artifact, not an IEEE fact.

Registered address / country

V.LE DELL'INDUSTRIA, 18, Vittuone (MI), IT 20010 [Confirmed] — IEEE MA-L

Company status

ABB SACE is an active low-voltage / circuit-breaker business division of ABB S.p.A. (Italian arm of the ABB Group, Zurich) [Confirmed] — abb.com heritage-brands (SACE), new.abb.com low-voltage catalog

Industry

low-voltage electrical distribution — air, molded-case, and solid-state circuit breakers / switchgear (OT/industrial) [Confirmed] — new.abb.com low-voltage product pages

Device types

circuit-breaker communication/monitoring/network-interface modules — most concretely SACE Emax 2 breakers with Ekip Com Ethernet accessories; broader SACE Emax/Emax2/Emax3, Tmax XT, and Formula families [Likely] — ABB "Communication with SACE Emax 2 circuit-breakers" white paper (doc 1SDC007412G0201/G0202). Tagged Likely because no source maps the AC:D3:64 prefix to a named part number in a manifest; the linkage is inferred from the product-family match plus the white paper directly addressing communication with SACE Emax 2 breakers.

Communication protocols

Modbus TCP (Ekip Com Modbus TCP module) plus Profinet, EtherNet/IP, Profibus, and DeviceNet across the Ekip Com accessory family; Ekip Signalling Modbus TCP is a companion DIN-rail gateway for breakers lacking native Ethernet

[Likely] — ABB SACE Emax 2 / Tmax XT manuals (Ekip Com), ABB library 1SDH001456R0002

Security context

OT/industrial asset class — low-voltage distribution/switchgear communication hardware for building and industrial electrical networks, intended for segmented OT networks behind firewalls, not internet-exposed. No AC:D3:64-specific CVE or CISA advisory was found in this pass; ABB as a corporate vendor has a broader documented ICS/CVE and CISA-advisory history, which is a general brand caution, not a per-device finding here

[Likely] — cisa.gov ICS advisories (general ABB history), ABB Emax 2 communication white paper

Related entities

ABB Group (parent, Zurich); other ABB-family OUI blocks — ABB Power T&D 00:90:4F, ABB AS Division Automation Products 00:1B:45, ABB AB Cewe-Control 00:0C:62, ABB Switzerland 00:12:93, ABB Ltd 60:39:1F; and ABB T&D Spa / SACE T.M.S. (Dalmine, separate block). The Vittuone "ABB SACE DIV." entity is distinct from each.

[Confirmed] — the IEEE MA-L registry, hwaddress.com

Additional registry matches

exactly one 'SACE' hit across IEEE MA-L, MA-M (the IEEE MA-M registry), and MA-S (the IEEE MA-S registry) — the AC:D3:64 MA-L block; no MA-M/MA-S SACE block exists [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

Registration date

Unknown — IEEE publishes no OUI registration dates; no first-party date source found [Unknown] — (no citation; honest null)

IANA reference

blank (this is a MAC OUI entry, not an IANA protocol registration) [Confirmed] — N/A

Analyst note

AC:D3:64 flags ABB SACE low-voltage breaker network hardware for asset classification; its appearance outside an OT/electrical-distribution segment is the signal worth investigating, not the device's mere identity.