Molex CMS — 3 prefixes (MA-L)

A MAC address starting with F8:2F:08, B4:C6:2E, or 00:09:3A belongs to Molex CMS, an IEEE-registered division tied to Molex, the global connector and cable-assembly manufacturer now owned by Koch Industries.

All three MA-L blocks are registered under the identical name "Molex CMS," which is stronger corroboration than a single OUI provides — it points to one real business unit rather than a one-off shell registration. Two of the three prefixes cite the same Lisle, Illinois address; the third, an older Downers Grove, Illinois address a few miles away, both consistent with Molex's Chicago-area presence.

What "CMS" expands to in the registrant name is not confirmed by any source found in this pass. Molex does sell rack cable-management products under a similar description, but nothing ties the registrant name itself to that product line, so any expansion would be a guess and is left unstated.

No forum post, device-fingerprinting database, or Wireshark-community reference was found identifying which specific hardware carries these three prefixes, and no CVE or security advisory names them. Given Molex's core business in connectors and cable assemblies, industrial or embedded connectivity gear is a plausible use, but that is inference from the parent company's line of business, not sourced device corroboration.

IEEE's public OUI data does not publish assignment dates, so no registration date is given for any of the three blocks here. Third-party sites such as maclookup.app display "registered"/"updated" dates for these prefixes, but those are that vendor's own database-ingestion artifacts, not facts published by IEEE.

IEEE assignment

3 prefixes → Molex CMS, registered Lisle, IL (x2) and Downers Grove, IL (x1), US [Confirmed] — IEEE MA-L (lines 1761, 9824, 25594)

Registry / block size

MA-L (Medium Access Control - Long form, 48-bit addresses); 3 IEEE prefixes registered under this exact name [Confirmed] — the IEEE MA-L registry, the Wireshark manufacturer database (lines 2349, 48298, 56642)

HQ / country

2222 Wellington Court, Lisle, IL 60532, US (current registry address for 2 of 3 blocks); 5224 Katrine Avenue, Downers Grove, IL 60515, US (older registry address, 1 block) [Confirmed] — IEEE MA-L

Company status

active — parent Molex is an operating Koch Industries subsidiary as of 2026 [Confirmed] — kochinc.com

Device types

Unknown — no sourced corroboration of specific hardware carrying these prefixes [Unknown]

Notable products

Unknown for this specific "CMS" division; parent Molex makes connectors, cable assemblies, and fiber-optic/industrial connectivity products [Likely] — kochinc.com, molex.com

Verified sample prefixes (all MA-L, Molex CMS)

F8:2F:08, B4:C6:2E, 00:09:3A [Confirmed] — IEEE MA-L

Historic block

none found — no pre-existing or superseded registration under this exact name was identified [Unknown]

Special note

IEEE's public OUI data (the IEEE MA-L registry columns: Registry, Assignment, Organization Name, Organization Address) publishes NO assignment/registration date for these blocks. maclookup.app shows "Initially registered"/"Registration Date" values for F82F08 and B4C62E (e.g. January 7, 2017 and August 11, 2018) — these are third-party database-ingestion artifacts, not IEEE facts, and must not be presented as IEEE registration dates.

[Confirmed] — maclookup.app (live lookups, this pass)

Related vendors

Molex Canada Ltd (00:50:16, Waterloo, Ontario); Molex Incorporated (2C:16:BD:E0/28, MA-M, Fremont, CA); XPAK MSA Group c/o Molex Fiber Optics (00:0A:CB, Downers Grove, IL) — same broader Molex family, registrant identity vs. "Molex CMS" not independently confirmed. SCIMOLEX CORPORATION (00:21:2D, Yamanashi, Japan) shares the "molex" substring in name only, with no evidence of a corporate tie — treated as unrelated.

[Likely] — the IEEE MA-L registry (lines 21897, 25594, 28325, 29251), the IEEE MA-M registry (line 4347)

Analyst note

Three independently-registered MA-L blocks under one exact registrant name, at consistent Molex-area addresses, plus a wider family of separately-named Molex OUI/MA-M registrations, together indicate a real operating division rather than a bare single-OUI shell — but no device-type or security corroboration exists for these specific prefixes, so usage context stays an honest Unknown. [Likely]