We Corporation Inc. — 4 prefixes (MA-L)

A MAC address beginning with 04:E7:7E, 18:B6:CC, 90:12:A1, or E0:0E:E1 belongs to We Corporation Inc., a South Korean manufacturer of PCB assembly-line test equipment, based on four confirmed IEEE MA-L assignments that all share the same registered Anyang-si, Gyeonggi-do address.

We Corporation's product line, marketed as "Check Master Systems" (models CMS-3000, CMS-7000, CMS-8000, CMS-9000), is a family of in-circuit testers used on electronics production lines to detect solder bridges, opens, shorts, and misplaced components on assembled circuit boards. Directory listings name Korean electronics manufacturers, including LG Electronics and Samsung, as clients.

Four separate OUI blocks under one org name and address is itself a substance signal — it rules out a bare shell registration — but the specific networked product or interface that consumes each MAC range could not be independently verified (no teardown, packet capture, or datasheet was found naming a device model to a MAC range). Attempts to fetch the company's own domains (wecorporation.co.kr, wecorp.co.kr) failed, so the product and client claims rest on secondary directory listings (Dun & Bradstreet, GoBizKorea) rather than a primary company-site source.

Two caveats matter for anyone researching this vendor. First, the "CMS-8000" model name collides with an unrelated, unrelated-company product: the Contec Health (China) CMS8000 patient monitor, which carries a documented hardcoded-backdoor and several CVEs — that vulnerability set belongs to Contec, not to We Corporation Inc., and should never be attributed here. Second, a differently-transliterated "We Corporation" (위코퍼레이션), a small Jeju-based hotel/home-network vendor, is a separate legal entity at a different address and is not the IEEE registrant discussed on this page.

IEEE assignment

4 prefixes → We Corporation Inc., registered Anyang-si, Gyeonggi-do, KR [Confirmed] — the IEEE MA-L registry (lines 1201, 9128, 16982, 25695)

Registry / block size

MA-L (24-bit OUI); holds 4 IEEE prefixes [Confirmed] — the IEEE MA-L registry. NOTE: IEEE's public OUI data publishes no assignment/registration date; any "date registered" on third-party tools is a database artifact, not an IEEE fact.

HQ / country

201, 33, Deokcheon-ro, Manan-gu, Anyang-si, Gyeonggi-do, KR 14088 [Confirmed] — the IEEE MA-L registry

Company status

Likely active (appears in current-looking D&B and GoBizKorea directory listings; no explicit closure/dissolution notice found) [Likely] — dnb.com, GoBizKorea

Device types

PCB in-circuit testers / "Check Master Systems" (CMS-3000, CMS-7000, CMS-8000, CMS-9000) [Likely] — dnb.com, GoBizKorea

Notable products

Check Master Systems CMS-3000/7000/8000/9000 [Likely] — dnb.com, GoBizKorea

Verified prefixes (all MA-L, We Corporation Inc.)

04:E7:7E, 18:B6:CC, 90:12:A1, E0:0E:E1 [Confirmed] — the IEEE MA-L registry

Founding date

self-reported 1985 on a company-profile fragment; this is a corporate/directory-sourced founding date, NOT an IEEE OUI registration date [Likely, not to be conflated with registration] — company profile fragment (page8.html), not independently corroborated

Named clients

LG Electronics, Samsung (per directory listing content) [Likely] — dnb.com, GoBizKorea

Security note

no CVEs/advisories found for We Corporation Inc. or its CMS product line; the "CMS-8000" name collides with the unrelated Contec Health CMS8000 patient-monitor backdoor (CVE-2024-12248, CVE-2025-0626, CVE-2025-0683) — do not attribute [Confirmed] — cisa.gov, thehackernews.com

Name-ambiguity note

a separately-transliterated "We Corporation" (위코퍼레이션), a Jeju hotel/home-network vendor at a different address, is a different legal entity and was not used as a source for any claim above [Likely] — Korean business-registry search result

Related vendors

none identified

Analyst note

four OUI blocks under one org/address rule out a bare single-OUI shell registration, but the primary company domains could not be fetched, so product/client claims rest on secondary directory sources — tagged Likely, not Confirmed. Guard against two name/model collisions when citing this entry: the Contec CMS8000 backdoor and the unrelated Jeju "We Corporation."