Toshiba — 12 prefixes (MA-L)

Toshiba holds 12 MA-L blocks (00:15:B7, E8:9D:87, 78:D6:B2, F4:64:5D, 00:08:0D, 00:0E:7B, E8:E0:B7, 88:73:84, 00:1C:7E, 00:23:18, B8:6B:23, EC:21:E5), all registered to the plain organization string "Toshiba" at 2-9, Suehiro-Cho, Ome, Tokyo, JP 198-8710 — the historic Ome Works, Toshiba's PC-manufacturing plant that operated from 1968 until its 2017 closure and is widely credited with developing and mass-producing the Toshiba T1100 (1985), commonly cited as the first commercial laptop PC. This consolidated entry deliberately excludes several separately-named Toshiba-family registrants that carry their own OUI blocks and belong under distinct vendor slugs, most notably Toshiba TEC Corporation Inc (C8:3A:1B), which is already finalized as vendor-toshiba-tec. Other excluded strings include Toshiba Corp., Toshiba Corporation, Toshiba Global Commerce Solutions, Toshiba Visual Solutions Corporation, Toshiba Samsung Storage Technology Korea Corporation, Toshiba Mitsubishi-Electric Industrial Systems Corporation, Toshiba Client Solutions Co. Ltd., Toshiba Toko Meter Systems Co. LTD (which itself holds a separate MA-M block), Toshiba Teli Corporation, and Toshiba Electron Tubes & Devices Co. Ltd (which holds a separate MA-S block). Devices carrying these 12 prefixes are predominantly notebook/laptop network interfaces from Toshiba's PC division, later spun off as Dynabook Inc. in 2018-2019; no vendor-specific security advisories or abuse patterns tied to this OUI family were found in available sources.

entry

vendor-toshiba [Confirmed] — internal pipeline identifier

status_in_pipeline

queued/uncovered — listed in this site's own enrichment records, no row yet in this site's own enrichment records; distinct from the already-DONE vendor-toshiba-tec (C8:3A:1B) [Confirmed] — file: this site's own enrichment records

registry_class

MA-L for all 12 matching blocks; no MA-M or MA-S block is registered to the plain org string "Toshiba" [Confirmed] — local IEEE MA-L snapshot (the IEEE MA-L registry), cross-checked against the IEEE MA-M registry and the IEEE MA-S registry

org_assignment / company

Toshiba [Confirmed] — IEEE MA-L registry

matching_oui_blocks (12)

00:15:B7, E8:9D:87, 78:D6:B2, F4:64:5D, 00:08:0D, 00:0E:7B, E8:E0:B7, 88:73:84, 00:1C:7E, 00:23:18, B8:6B:23, EC:21:E5, all address "2-9, Suehiro-Cho, Ome, Tokyo, JP 198-8710" [Confirmed] — the IEEE MA-L registry (IEEE MA-L snapshot), lines 2684, 2685, 3289, 9761, 10587, 10588, 10589, 11322, 26386, 26387, 26388, 35124

date_registered

null — IEEE's public OUI data publishes no assignment/registration date field; not fabricated [Confirmed absence of an IEEE-published date] — the IEEE MA-L registry column set (Registry, Assignment, Organization Name, Organization Address only)

date_caveat

maclookup.app displays "First registration: 24 October 2001" for the Toshiba vendor page; per standing policy this is a third-party database-crawl artifact, not an IEEE fact, and must not be recorded as an allocated/registration date [Confirmed] — https://maclookup.app/vendors/toshiba

iana_reference

not applicable — no IANA RFC reference exists for an IEEE MA-L vendor OUI block; field stays blank rather than fabricated [Confirmed]

company_substance / historic facility

the registered address is Toshiba's Ome Works (Tokyo), operating 1968–2017, credited with developing and mass-producing the Toshiba T1100 (1985), widely cited as the first commercial laptop PC — establishes verifiable substance beyond a bare registration [Confirmed] — https://ethw.org/Milestones:Toshiba_T1100,_a_Pioneering_Contribution_to_the_Development_of_Laptop_PC,_1985 , https://www.thecasecentre.org/products/view?id=43418 , https://en.wikipedia.org/wiki/Toshiba

device_usage

devices carrying these prefixes are predominantly notebook/laptop PC network interfaces from Toshiba's PC division, later spun off as Dynabook Inc. (2018–2019), which continued using legacy Toshiba OUI blocks per public lookup aggregators; no independent device-type telemetry beyond generic "network device" classification was found [Likely] — https://maclookup.app/vendors/toshiba , https://www.netify.ai/resources/macs/brands/toshiba , https://mac.lc/company/toshiba , https://en.wikipedia.org/wiki/Dynabook_Inc.

security_context

no vendor-specific security advisory, botnet association, or abuse pattern was found tied to this OUI family in the sources checked; absence of findings, not a confirmed clean bill [Unknown] — no citation available

related_but_distinct_orgs_excluded

Toshiba TEC Corporation Inc (C8:3A:1B, already DONE as vendor-toshiba-tec), Toshiba Corp., Toshiba Corporation, TOSHIBA CORPORATION, Toshiba Global Commerce Solutions, Toshiba Visual Solutions Corporation Co.,Ltd, Toshiba Samsung Storage Technology Korea Corporation, Toshiba Mitsubishi-Electric Industrial Systems Corporation, Toshiba Client Solutions Co. Ltd., Toshiba Toko Meter Systems Co. LTD (separate MA-M block), Toshiba Teli Corporation, Toshiba Electron Tubes & Devices Co. Ltd (separate MA-S block)

[Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry cross-check