ECS s.r.l. — 2 prefixes (MA-M + MA-S)

The IEEE registry that actually backs the ecs slug resolves to ECS s.r.l., an Italian company at Via dell'Artigianato n. 24, Belluno (BL), IT 32100, which holds exactly two blocks: one MA-M (D0:96:86:C, a 28-bit assignment) and one MA-S (70:B3:D5:48:7, a 36-bit assignment). Neither is a full 24-bit MA-L OUI — ECS s.r.l. does not appear in the MA-L (the IEEE MA-L registry) registry at all, so this is a small registrant with a partial-block allocation typical of low-volume hardware vendors. A critical disambiguation applies to the bare token "ECS": the much larger and better-known Elitegroup Computer Systems Co., Ltd. (ECS) of Taipei, Taiwan — the motherboard/mini-PC OEM publicly traded as TWSE 2331 — is a completely different registrant and is the entity most web searches surface for "ECS." Elitegroup's IEEE footprint is a separate set of ~24 MA-L OUIs registered under its own full legal name, not under "ECS s.r.l." Several other unrelated registrants also share the "ECS" substring (Avaya ECS Ltd, BECS Technology Inc, Elecsys International Corporation). Per the registry-of-record, this entry documents the Italian ECS s.r.l. blocks; the Taiwanese Elitegroup material is preserved below as cross-reference context, tagged accordingly. As always for OUI data, IEEE publishes no per-block registration date — none is recorded here.

IEEE assignment (registry of record)

2 prefixes → ECS s.r.l. — one MA-M (D0:96:86:C) + one MA-S (70:B3:D5:48:7) [Confirmed] — the IEEE MA-M registry line 5251; the IEEE MA-S registry line 3253

Registry / block size

MA-M (28-bit) + MA-S (36-bit); NOT present in MA-L (the IEEE MA-L registry) [Confirmed] — the IEEE MA-M registry line 5251; the IEEE MA-S registry line 3253; the IEEE MA-L registry (no match for "ECS s.r.l.")

Registered address / country

Via dell'Artigianato n. 24, Belluno (BL), IT 32100, Italy [Confirmed] — the IEEE MA-M registry line 5251; the IEEE MA-S registry line 3253 (consistent across both blocks)

Registration date

Unknown — IEEE publishes NO assignment/registration date for any OUI/MA-M/MA-S block (the IEEE MA-L registry columns are only Registry, Assignment, Organization Name, Organization Address); any third-party "date registered" is a database artifact, not an IEEE fact

[Confirmed null] — IEEE registry schema

Total prefix count

2 [Confirmed] — the IEEE MA-M registry line 5251; the IEEE MA-S registry line 3253

Company status / device types (ECS s.r.l.)

Unknown — registry-only entity; web research targeted the unrelated Taiwanese "ECS" and did not surface independent detail on the Belluno ECS s.r.l. [Unknown] — no source

Disambiguation — NOT this entry but commonly confused

Elitegroup Computer Systems Co., Ltd. (ECS), Taipei, Taiwan; PC motherboard/mini-PC (LIVA series) OEM; TWSE 2331; founded 1987; ~24 MA-L OUIs under its own full legal name. Distinct IEEE registrant from ECS s.r.l. [Likely — single registry-naming inference + web profile] — https://en.wikipedia.org/wiki/Elitegroup_Computer_Systems; https://maclookup.app/vendors/elitegroup-computer-systems-co-ltd; https://www.ecs.com.tw/en

Other "ECS"-substring registrants (all distinct)

Avaya ECS Ltd (00:E0:07, MA-L, UK); BECS Technology Inc (US); Elecsys International Corporation (US) [Confirmed distinctness] — the cached registry snapshots (partial-match scan)

IANA reference

blank — OUI/MA-M/MA-S registry entries carry no IANA reference [Confirmed null] — IEEE registry schema

Analyst note

A globally-administered ECS s.r.l. MAC (D0:96:86:C / 70:B3:D5:48:7) identifies that specific small Italian registrant's hardware; do NOT conflate with Elitegroup (Taiwan) MACs, which use entirely different MA-L prefixes. If a sighting traces to an Elitegroup OUI it most likely indicates an onboard NIC in an ECS-branded motherboard, mini-PC, or laptop — standard PC-endpoint context, no ICS/OT connotation. No public CVE surface was found for either ECS entity's network-facing hardware.