1Finity Inc. — 2 prefixes (1x MA-L + 1x MA-S)

A MAC address beginning with 38:A3:E0, or falling within the 8C:1F:64:EB:4 sub-block, belongs to 1Finity Inc., a Fujitsu Limited subsidiary that builds carrier-grade optical and wireless transport networking equipment. Both IEEE registrations resolve to the same Kawasaki, Japan address, confirming one company rather than two unrelated registrants sharing a name.

1Finity began operations on July 1, 2025, consolidating four existing Fujitsu network-related group companies — Fujitsu Telecom Networks, Fujitsu Network Service Engineering, Mobile Techno Corp., and Fujitsu Network Communications — into one roughly 1,800-employee entity. Its stated focus is open optical and wireless networking, network automation, and applied AI/ML sold to telecom service providers and network operators.

The 1FINITY brand covers optical transport and transponder equipment for carrier and 5G mobile-transport networks, including the 1FINITY T300/T310 and T600 Transport series named on Fujitsu's own product pages. No source ties either exact MAC prefix to a specific model, so the match is confirmed at the vendor level, with product-family naming held at Likely rather than Confirmed.

The 8C:1F:64:EB:4 block is a 36-bit sub-allocation carved from the shared IEEE base 8C:1F:64, which the same registry lists with 2,831 total MA-S sub-blocks assigned to many unrelated companies. 1Finity owns only its EB4 slice, not the 8C:1F:64 base itself — a MAC elsewhere under that base identifies a different company entirely.

No CVE is recorded for 1FINITY-branded products as of an August 2026 search, and no malware or botnet association surfaced either — a sourced negative, not a full threat-intel clearance. IEEE publishes no registration date for either OUI; a third-party lookup site's differing "first seen" crawl timestamps for the two registrant-string variants are not IEEE facts and are not used here.

Company

1Finity Inc. (brand "1FINITY"), a wholly-owned Fujitsu Limited subsidiary

Device class

Carrier-grade optical transport / transponder networking equipment for 5G mobile-transport and open optical networks

Registered prefixes

38:A3:E0 (MA-L, full 24-bit OUI); 8C:1F:64:EB:4 (MA-S, 36-bit sub-block of shared base 8C:1F:64)

Registrant strings

"1Finity Inc" (MA-L row) and "1Finity Inc." (MA-S row) — same address, same company, punctuation differs only by registry

Security posture

No CVE or malware/botnet association found as of an August 2026 search — a sourced negative, not a full clearance

IEEE assignment (MA-L)

38:A3:E0 → 1Finity Inc, registered Kawasaki-shi, Kanagawa, JP [Confirmed] — the IEEE MA-L registry 38A3E0

IEEE assignment (MA-S)

8C:1F:64:EB:4 → 1Finity Inc., registered same Kawasaki address [Confirmed] — the IEEE MA-S registry 8C1F64EB4

Registry / block size

1x MA-L (24-bit) + 1x MA-S (36-bit sub-block); 2 total IEEE assignments [Confirmed] — the IEEE MA-L registry 38A3E0, the IEEE MA-S registry 8C1F64EB4

Shared-base caveat

8C:1F:64:EB:4 is a sub-allocation of the shared IEEE base 8C:1F:64, which carries 2,831 total MA-S sub-blocks assigned across many unrelated companies — 1Finity does not own the 8C:1F:64 base itself [Confirmed] — the IEEE MA-S registry (8C1F64* rows)

HQ / country

4-1-1 Kamikodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa 211-8588, JP [Confirmed] — the IEEE MA-L registry 38A3E0, the IEEE MA-S registry 8C1F64EB4

Parent company

Fujitsu Limited; 1Finity began operations July 1, 2025, consolidating four Fujitsu network-group companies (Fujitsu Telecom Networks, Fujitsu Network Service Engineering, Mobile Techno Corp., Fujitsu Network Communications), ~1,800 employees [Confirmed] — https://www.businesswire.com/news/home/20250630235426/en/1Finity-a-Fujitsu-Company-Commences-Operations-and-Reveals-Brand-Identity, https://www.nasdaq.com/press-release/fujitsu-launches-new-company-1finity-strengthen-network-products-business-2025-04-25

Company status

active (operating since July 2025) [Confirmed] — https://www.businesswire.com/news/home/20250630235426/en/1Finity-a-Fujitsu-Company-Commences-Operations-and-Reveals-Brand-Identity

Device types / product line

carrier optical transport and transponder equipment for 5G mobile-transport networks — 1FINITY T300/T310 and T600 Transport series [Likely — source pages returned HTTP 403 on direct fetch; sourced from search-result snippets] — https://www.fujitsu.com/us/products/network/products/1finity-t300-t310/, https://www.fujitsu.com/us/products/network/products/1finity/

Prefix-to-model mapping

no source ties either exact MAC prefix (38:A3:E0 or 8C:1F:64:EB:4) to one named device model [Unknown]

No IEEE registration dates

the IEEE MA-L registry/oui36.csv schema (Registry, Assignment, Organization Name, Organization Address) carries no date field for either assignment [Confirmed] — the IEEE MA-L registry 38A3E0, the IEEE MA-S registry 8C1F64EB4

Third-party date caveat

maclookup.app lists differing "first seen" crawl dates for the two registrant-string variants (2026-03-09 for "1Finity Inc"; 2025-12-24 for "1Finity Inc.") — these are that site's crawl timestamps, not IEEE assignment dates, and are excluded from the JSON date fields

[Likely] — https://maclookup.app/vendors/1finity

Security context

no CVE recorded for 1FINITY-branded products, no malware/botnet association found, as of an August 2026 search [Likely — sourced negative from the searches performed, not full CVE/threat-intel database coverage]

Related vendors

Fujitsu Telecom Networks Limited, Fujitsu Network Service Engineering Limited, Mobile Techno Corp., Fujitsu Network Communications, Inc. (predecessor entities consolidated into 1Finity on 2025-07-01) [Confirmed] — https://www.businesswire.com/news/home/20250630235426/en/1Finity-a-Fujitsu-Company-Commences-Operations-and-Reveals-Brand-Identity

Analyst note

two independent IEEE assignments (MA-L + MA-S) at the same registered address, plus an identifiable Fujitsu-subsidiary corporate identity and named carrier-optical product lines, place this well above a bare single-OUI shell registration.