Cambridge Industries Group — 13 prefixes (MA-L)

Cambridge Industries Group holds 13 IEEE MA-L (classic 24-bit) OUI assignments registered under two related name strings — "Cambridge Industries(Group) Co.,Ltd." (12 blocks) and "Cambridge Industries Group (CIG)" (1 block, the sole US-address row) — spread across four registered addresses: three in Shanghai and one in San Jose, CA. This is the same real-world company as the already-published vendor-cig-shanghai entry (24 prefixes under the distinct registrant string "CIG SHANGHAI CO LTD"), confirmed by an identical Shanghai building address (5/F Building 8, 2388 Chenhang Road, Minhang District) shared by five of these 13 prefixes with that sibling entry's full block. Cambridge Industries Group (CIG) is a Shanghai Stock Exchange-listed (603083) ODM/JDM/OEM networking-hardware manufacturer founded 2005, with a Shanghai headquarters and a Santa Clara/San Jose, CA sales-and-R&D presence, and a live current product catalog spanning Wi-Fi 6/7 routers and access points, GPON/xPON ONT broadband terminals, carrier-grade Ethernet switches, and optical transceivers shown as recently as OFC 2026 trade-show coverage. Thirteen OUI blocks under an identifiable, publicly traded, product-shipping manufacturer — plus the corroborating 24-block sibling registration — places this well past bare single-OUI shell territory.

Organization names

"Cambridge Industries(Group) Co.,Ltd." (12 of 13 rows) and "Cambridge Industries Group (CIG)" (1 row, the US-address entry) — same company, two IEEE-listed spellings [Confirmed] — the IEEE MA-L registry (13 matching rows)

Registry class

MA-L (24-bit OUI); no MA-M or MA-S entries found for either name string [Confirmed] — the IEEE MA-L registry

Prefixes (13)

00:0B:40, 00:19:C7, 4C:F2:BF, 4C:FA:CA, 5C:1A:6F, 70:D9:31, 9C:50:EE, A4:C7:DE, A8:25:EB, A8:58:40, D0:54:2D, E0:1D:3B, FC:B6:98 [Confirmed] — the IEEE MA-L registry

Registered addresses

(1) 2560 Junction Avenue, San Jose, CA 95134, US — 00:0B:40 only; (2) Room 309, 333 Hong Qiao Road, Shanghai, CN 200030 — 00:19:C7 only; (3) 22F Qilai Tower, 889 Yishan Road, Shanghai, CN 200233 — 4C:F2:BF, 70:D9:31, A4:C7:DE, D0:54:2D, FC:B6:98 (plus E0:1D:3B as a minor address-string variant); (4) 5/F Building 8, 2388 Chenhang Road, Minhang District, Shanghai, CN 201114 — 4C:FA:CA, 5C:1A:6F, 9C:50:EE, A8:25:EB, A8:58:40, matching the address on the already-DONE vendor-cig-shanghai sibling entry

[Confirmed] — the IEEE MA-L registry

Allocated date

Unknown — IEEE's public MA-L registry (the IEEE MA-L registry) carries no assignment/registration date field for any entry; none fabricated [Confirmed absence of data]

IANA reference

not applicable (blank) — IANA RFC references apply to protocol/port assignments, a different registry namespace than IEEE MAC OUI assignments [Confirmed]

Corporate identity

Cambridge Industries Group (CIG), Shanghai Stock Exchange-listed (603083), ODM/JDM/OEM networking-hardware manufacturer, founded 2005, HQ Shanghai with Santa Clara/San Jose, CA presence [Confirmed] — https://www.cigtech.com/, https://wifinowglobal.com/organisation/cig/

Device/product context

Wi-Fi 6/7 access points and residential gateways/routers (Wi-Fi, G.hn, MoCA), GPON/xPON ONT broadband terminals (XGS/25G/50G), carrier-grade Ethernet switches (SDN/NFV white-box), and high-speed optical transceivers, mirroring the device classes on the sibling vendor-cig-shanghai entry [Confirmed] — https://www.cigtech.com/, https://www.thefastmode.com/technology-solutions/40820-cambridge-industries-group-cig-debuts-high-speed-transceivers-and-wi-fi-7-routers-at-ofc

Security context

no CIG/Cambridge-Industries-Group-specific CVEs, advisories, or botnet attributions found (including a Mirai-focused check); current Mirai-variant campaigns name other vendors, not CIG; category-level CPE remote-management attack surface applies but is not a documented CIG incident [Likely — absence of evidence, not evidence of absence] — https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-002/, https://www.bleepingcomputer.com/news/security/new-mirai-botnet-targets-industrial-routers-with-zero-day-exploits/

Third-party date artifact (excluded)

maclookup.app states prefix 00:0B:40 was "registered ... 14 October 2002" — this is a third-party database timestamp, not an IEEE fact, and is excluded from the JSON per no-fabrication rule, same treatment as the sibling entry

[Confirmed exclusion] — https://maclookup.app/vendors/cambridge-industries-group-cig

Related-vendor cross-reference

same company as the already-DONE vendor-cig-shanghai (24 prefixes, registrant string "CIG SHANGHAI CO LTD"); this entry's 13 prefixes are entirely distinct from that entry's 24 (no prefix overlap), so the two are complementary registration clusters for one company rather than duplicates

[Confirmed] — /mac/vendor/cig-shanghai/, the IEEE MA-L registry

Substance verdict

13 OUI assignments across 4 addresses, corroborated by a shared address and a 24-prefix sibling registration for the same identifiable, publicly traded, product-shipping manufacturer — qualifies as a substantive vendor, not a bare shell [Confirmed]