Zhen Shi Information Technology (Shanghai) Co., Ltd. — 4 prefixes (MA-L)

Zhen Shi Information Technology (Shanghai) Co., Ltd. holds four separate 24-bit MA-L blocks in the IEEE registry — 10:7B:93, 30:C9:1B, 6C:2D:24, and 78:8B:2A — all sharing the identical registry address at 5F, Building 3, No. 401 Caobao Road, Xuhui District, Shanghai. Holding multiple MA-L allocations under one identity is itself a substance signal: it points to a manufacturer shipping enough distinct hardware to exhaust and re-request 24-bit blocks, rather than a one-off single-OUI shell. Independent corroboration ties this legal entity to the consumer wearables brand "Mibro" (and the "Xunkids" / xiaoxun kids' watch-phone line). Mibro's own about-us page self-identifies Zhenshi Information Technology as the company behind the brand, a USPTO trademark filing names "MIBRO — Zhenshi Information Technology (Shanghai) Company Limited" as applicant, and FCC filings under grantee ID 2AXCI show roughly twenty device grants (2020–2023) with model prefixes consistent with smartwatch and wearable hardware. Devices carrying these OUIs are therefore most plausibly consumer smartwatches, kids' GPS watch-phones, and possibly wireless earphones — end-user wearable/IoT hardware with Wi-Fi/Bluetooth radios, not networking infrastructure. As with any MAC prefix, no assignment date is available: IEEE publishes none, and any "registration date" shown by third-party lookup tools is a database artifact, not an IEEE fact.

IEEE assignment

4 MA-L prefixes → Zhen Shi Information Technology (Shanghai) Co., Ltd., registered Shanghai, CN [Confirmed] — IEEE MA-L

Registry / block size

MA-L (24-bit OUI); 4 blocks. No MA-M or MA-S assignments found for this org [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

Assigned prefixes (all MA-L)

10:7B:93, 30:C9:1B, 6C:2D:24, 78:8B:2A [Confirmed] — the IEEE MA-L registry (corroborated by maclookup.app)

HQ / country

5F, Building 3, No. 401 Caobao Road, Xuhui District, Shanghai 200233, CN [Confirmed] — IEEE MA-L. Registry note: a stray "?" appears after "Building 3" in all four rows — a mojibake/encoding artifact in IEEE's source CSV, not part of the address.

Org-name variant

the 30:C9:1B row records the name with fullwidth CJK parentheses ("（Shanghai）") instead of ASCII — same organization, a registry data-entry variant, not a distinct company [Confirmed] — the IEEE MA-L registry

Company status

active [Likely] — Mibro brand site mibrofit.com (self-published); LinkedIn / ZoomInfo company listings

Company identity

legal entity behind the "Mibro" smartwatch/wearables brand and the "Xunkids" (xiaoxun) kids' watch-phone brand; Shanghai HQ, founded 2015, Xiaomi-ecosystem-chain associated [Likely] — mibrofit.com/pages/about-us; USPTO TM 79280668

Device types

consumer smartwatches, kids' GPS watch-phones, wireless earphones/accessories (Wi-Fi/Bluetooth wearables) [Likely] — FCC grantee 2AXCI filings; mibrofit.com; not a per-prefix-to-model mapping

Registration date

Unknown / not applicable — IEEE publishes no OUI assignment dates; maclookup.app's "2019-10-31" / "2025-05-09" for 78:8B:2A are third-party database artifacts, not IEEE facts. Do not present as an IEEE registration date. [Confirmed] — IEEE the IEEE MA-L registry has no date column

IANA reference

none — IANA has no reference for IEEE MAC/OUI vendor assignments; field blank [Confirmed]

Security / abuse context

no incidents, CVEs, or abuse/botnet reports tied to these OUIs or to Zhenshi/Mibro devices found in this pass (light pass, not an exhaustive threat-intel sweep). Vendor self-claims a TÜV SÜD ETSI EN 303 645 IoT cybersecurity certification for the Mibro brand — a self-published claim, not independently audited here.

[Likely] — mibrofit.com/blogs/news

Analyst note

A globally-administered address in one of these blocks identifies genuine Zhenshi/Mibro hardware; however wearables often use MAC randomization on Wi-Fi, so absence of the OUI does not mean "not this vendor." Direct IEEE registry re-verification of 78:8B:2A was blocked by an anti-bot HTTP 418 in this pass; the registrant string is confirmed from the cached IEEE CSV plus third-party mirrors.