2CRSI — 1 prefix (MA-L)

A MAC address starting with 3C:3F:51 belongs to 2CRSI, a publicly traded French server manufacturer based in Strasbourg. The prefix is 2CRSI's only registered IEEE MA-L block, so any device presenting it should be treated as originating from 2CRSI-branded hardware — most plausibly a network interface controller or baseboard management controller (BMC) port on a server or workstation the company builds.

2CRSI (also styled 2CRSi) designs and manufactures GPU/AI servers, high-density compute servers, OCP-form-factor servers and racks, rugged and edge systems, and liquid-cooled server platforms. The company is listed on Euronext Paris under ticker 2CRSI.PA and reports operations across France, Belgium, the Netherlands, the UK, the US, and the UAE, selling into data center, cloud, HPC, and AI/ML markets.

Unlike vendors holding hundreds of OUI blocks, 2CRSI's IEEE footprint is a single MA-L assignment (3C:3F:51), corroborated independently by the Wireshark manufacturer database, which maps the same prefix to "2Crsi." IEEE's public OUI data carries no assignment-date field, so no registration date can be reported for this block.

No CVE or security advisory naming 2CRSI was found as of an August 2026 web search — a sourced negative rather than a confirmed absence of any vulnerability. The company's public product pages do not detail NIC or BMC specifics at the vendor-overview level, so the exact interface type carrying this prefix on a given device is inferred from product category rather than directly confirmed.

Vendor

2CRSI (also styled 2CRSi) — [Confirmed] the IEEE MA-L registry

Registry block

MA-L, single prefix 3C:3F:51 — [Confirmed] the IEEE MA-L registry

Device class

Server and workstation hardware — GPU/AI servers, HPC/high-density servers, OCP servers and racks, edge/rugged systems — [Confirmed] https://2crsi.com/

Likely interface

Network interface controller or BMC/management port on 2CRSI server hardware — [Likely] inferred from product line, not confirmed at spec level

Registry corroboration

Wireshark manufacturer database independently maps 3C:3F:51 to "2Crsi" — [Confirmed] the Wireshark manufacturer database

Second block search

No additional MA-L, MA-M, or MA-S block for 2CRSI found — [Confirmed] the IEEE MA-S registry, the IEEE MA-M registry

HQ / country

Strasbourg, France (FR) — [Confirmed] the IEEE MA-L registry

Stock listing

Euronext Paris, ticker 2CRSI.PA — [Confirmed] https://2crsi.com/history

IEEE assignment

3C:3F:51 → 2CRSI, registered Strasbourg, France (FR) [Confirmed] — the IEEE MA-L registry

Registry / block size

MA-L (24-bit OUI); single IEEE prefix — no second MA-L, MA-M, or MA-S block found [Confirmed] — the IEEE MA-L registry, the IEEE MA-S registry, the IEEE MA-M registry

HQ / country

32 rue Jacobi-Netter, Strasbourg, France, FR 67200 [Confirmed] — the IEEE MA-L registry

Company status

active, publicly traded (Euronext Paris: 2CRSI.PA) [Confirmed] — https://2crsi.com/history

Device types

GPU/AI servers, high-density/mainstream compute servers, OCP-form-factor servers and racks, rugged/edge systems, high-performance workstations, microclusters [Confirmed] — https://2crsi.com/

Notable products

GPU/AI server lines, OCP servers and racks, liquid-cooled server platforms [Confirmed] — https://2crsi.com/manufacturing-facilities

Verified sample prefix

3C:3F:51 (only known block) [Confirmed] — the IEEE MA-L registry, the Wireshark manufacturer database

Historic block

None found — no evidence of any 2CRSI OUI assignment predating 3C:3F:51 within checked registries [Confirmed absence within scope checked] — the IEEE MA-L registry, the IEEE MA-S registry

Date registered

Unknown — IEEE's public OUI data carries no assignment-date field, and no third-party date value for this prefix was found in the bundled registries [Confirmed] — the IEEE MA-L registry, the Wireshark manufacturer database

Security context

No CVE or security advisory naming 2CRSI found as of an August 2026 web search [Likely — sourced negative, not exhaustive]

Related vendors

None identified [Unknown]

Analyst note

A MAC beginning 3C:3F:51 reliably indicates 2CRSI-branded server or workstation hardware, since the company holds only this one OUI block; treat it as a NIC or BMC interface on 2CRSI equipment rather than a specific model without further data [Likely] — inference from product-line context