COOSEA GROUP (HK) COMPANY LIMITED — 2 prefixes (MA-L)

A MAC address beginning 1C:9F:4E or D8:3E:EF belongs to COOSEA GROUP (HK) COMPANY LIMITED, a Hong Kong-registered ODM smartphone maker. The clearest confirmed device tied to these blocks is the SL100EA, an FCC-authorized LTE Android phone sold in the US as the Cricket Wireless "Vision Plus."

IEEE's public OUI registry lists two separate MA-L (24-bit) blocks assigned directly to this company, both registered to the same Tsim Sha Tsui, Kowloon address. Neither prefix is a sub-allocation carved out of a shared IEEE base like 70:B3:D5 — each is a full, independently-owned /24-equivalent block, so hardware carrying either prefix is attributable to Coosea specifically, not to an unrelated company sharing a base.

FCC equipment-authorization filings under grantee code 2A28U name COOSEA GROUP (HK) COMPANY LIMITED as applicant for the SL100EA — Android 12, 6.0-inch display, 3GB/32GB storage, Wi-Fi calling and hotspot support — with SAR test reports and a user manual on file. Device-fingerprint databases (device.report, DeviceAtlas) list several additional model numbers under the Coosea vendor name, but without retrievable spec sheets those should be treated as unverified model numbers only.

A same-named parent, "Coosea Group," runs a Chinese-language corporate site and appears in business directories as a 2006-founded ODM that also owns the KOOBEE brand, but the parent-subsidiary link to this exact HK entity is unconfirmed. A third-party aggregator (maclookup.app) surfaced a 2025 "registered" date for D8:3E:EF — that is a database artifact, not an IEEE-published fact.

Vendor name

COOSEA GROUP (HK) COMPANY LIMITED [Confirmed] — the IEEE MA-L registry 1C9F4E, the IEEE MA-L registry D83EEF

Registry class

MA-L (24-bit OUI) [Confirmed] — the IEEE MA-L registry 1C9F4E, the IEEE MA-L registry D83EEF

Prefixes

1C:9F:4E, D8:3E:EF — two independent MA-L blocks, neither a sub-allocation of a shared IEEE base [Confirmed] — the IEEE MA-L registry 1C9F4E, the IEEE MA-L registry D83EEF

Registered address

Unit 5-6, 16/F Multifield Plaza, 3-7A Prat Avenue, Tsim Sha Tsui, Kowloon, Hong Kong SAR, 999077 [Confirmed] — the IEEE MA-L registry 1C9F4E, the IEEE MA-L registry D83EEF

MAM / OUI-36 registry entries

none found for this org [Confirmed] — the IEEE MA-M registry, the IEEE MA-S registry

IEEE assignment dates

not published; the IEEE MA-L registry carries no date column [Confirmed] — the IEEE MA-L registry

Confirmed device

SL100EA LTE Android smartphone (Android 12, 6.0" display, 3GB/32GB), FCC grantee 2A28U, sold as Cricket Wireless "Vision Plus" [Likely] — https://fccid.io/2A28USL100EA, https://device.report/cricket/sl100ea

Additional device.report/DeviceAtlas model listings (GMC-668M, SL104D, SN304AE, SN515AR, SP545C)

unverified model numbers only, no confirmed spec sheets [Unknown] — https://device.report/coosea-group-hk/sl100ea, https://deviceatlas.com/device-data/devices/coosea

Parent group relationship (cooseagroup.com, "Coosea Group," ODM founded 2006, owns KOOBEE brand)

name/address correspondence only; corporate-registry link to this exact HK entity not independently verified [Likely] — https://www.cooseagroup.com, https://www.crunchbase.com/organization/coosea-group

Security/CVE association

none found as of an August 2026 NVD and web search — absence of evidence, not a clearance [Likely] — https://nvd.nist.gov/vuln/search

Third-party MAC-lookup date artifact for D8

3E:EF ("registered 23 May 2025" per maclookup.app): not an IEEE fact, database artifact only [Confirmed] — https://maclookup.app/macaddress/d83eef