UNISOC's MAC footprint surfaces under the legacy IEEE registrant "Spreadtrum Communications (Shanghai) Co., Ltd." — no separate "UNISOC" registrant surfaced — holding a single MA-L block, 40:45:DA (about 16.8 million addresses), with the registrant listing the Spreadtrum Center, No. 2288 Zuchongzhi Rd, Shanghai, China. These OUIs appear on smartphone and tablet application processors, 4G/5G cellular modems, feature-phone chips, and IoT/connectivity SoCs. The Spreadtrum → UNISOC rebrand was announced 2018-06-13 (Unigroup Spreadtrum & RDA, a core subsidiary of Tsinghua Unigroup; Intel invested $1.5 billion for a 20% stake around the 2018 merger), and UNISOC has since become the fourth-largest mobile-processor maker (about 13% global share in 2024). The key analyst point is the chipset pattern plus a critical caveat: a 40:45:DA OUI identifies a device built on Spreadtrum/UNISOC silicon regardless of brand, but modern smartphones randomize their Wi-Fi MAC, so a UNISOC-based phone usually presents a randomized (locally-administered) MAC rather than this chipset OUI. For triage, a literal 40:45:DA is more likely an IoT or feature-phone device with a burned-in address; on smartphones, expect MAC randomization instead.
- IEEE assignment
- 1 prefix → "Spreadtrum Communications (Shanghai) Co., Ltd." (40:45:DA); no separate "UNISOC" registrant surfaced [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L; 1 block (~16.8M addresses) [Confirmed] — maclookup.app (IEEE-sourced)
- HQ / country
- Spreadtrum Center, No. 2288 Zuchongzhi Rd, Shanghai 201203, China [Likely] — secondary source (uic.io)
- Company status
- active; Spreadtrum → UNISOC rebrand announced 2018-06-13 (Tsinghua Unigroup subsidiary; Intel took 20% for $1.5B around 2018) [Confirmed] — PR Newswire
- Device types
- smartphone/tablet application processors, 4G/5G cellular modems, feature-phone chips, IoT/connectivity SoCs [Confirmed] — corporate
- Notable products
- budget smartphone/tablet SoCs, 4G/5G modems, feature-phone + IoT chips
- Verified prefix
- 40:45:DA (MA-L) [Confirmed] — maclookup.app
- Special note
- Chipset-OUI case AND a rebrand-lineage flag (Spreadtrum/UNISOC). Fourth-largest mobile-processor maker (~13% global share 2024). Modern smartphones randomize the Wi-Fi MAC, so a UNISOC-based phone usually presents a randomized (locally-administered) MAC, NOT the 40:45:DA chipset OUI. The IEEE registry publishes no assignment dates, so none is stated here. [Confirmed]
- Related vendors
- MediaTek, Qualcomm, Apple (mobile-SoC peers); Tsinghua Unigroup (parent)
- Analyst note
- A 40:45:DA device is built on Spreadtrum/UNISOC silicon, but the brand is unknown from the OUI. On smartphones, expect MAC randomization (locally-administered bit set) rather than this OUI; a literal 40:45:DA is more likely an IoT/embedded device.