SERNET (SUZHOU) TECHNOLOGIES CORPORATION — D8:21:DA (MA-L) + 12 MA-M blocks

The vendor-sernet slug resolves to SERNET (SUZHOU) TECHNOLOGIES CORPORATION, a Chinese OEM/ODM hardware manufacturer based in Suzhou Industrial Park, Jiangsu Province. In the local IEEE registry caches the organization holds one MA-L (24-bit) assignment, D8:21:DA, plus twelve MA-M (28-bit) blocks recorded in mam.csv; no MA-S (36-bit) assignment was found. Third-party MAC lookup sites attribute a larger MA-L footprint to the same registered name, but only D8:21:DA is confirmed in the local MA-L cache, so the broader count is treated as Likely rather than Confirmed. Trade records describe the company as a contract manufacturer of consumer and SOHO networking gear — wireless routers, modem-routers, USB Wi-Fi adapters, VoIP gateways, IP cameras, and NAS units — supplied under OEM contracts to brands including NETGEAR and ARRIS. The single most important caveat is disambiguation: this entity is entirely distinct from SerNet GmbH (sernet.de, Göttingen, Germany), an information-security software and managed-services firm that holds no MAC OUI registrations. The lone CVE found under the bare vendor string "sernet" (CVE-2021-36981, in the verinice governance software) belongs to the German company, not this OUI holder, and must not be attributed to SERNET Suzhou hardware. As with every OUI entry, IEEE publishes no registration date for these blocks; any "date registered" shown on third-party lookup tools is a database artifact, not an IEEE fact, and no date is recorded here.

IEEE assignment (MA-L)

D8:21:DA → SERNET (SUZHOU) TECHNOLOGIES CORPORATION [Confirmed] — local enrichment/registries/oui.csv (line 388)

IEEE assignments (MA-M, 28-bit)

C4:A5:59:E, 88:3C:C5:9, 38:1F:26:1, 50:A0:30:D, D0:96:86:0, 8C:51:09:A, 48:5E:0E:6, 04:C9:8B:0, B4:4D:43:7, 58:48:49:4, 8C:55:70:B, 7C:83:34:9 (12 blocks) [Confirmed] — local enrichment/registries/mam.csv

MA-S (36-bit)

none found [Confirmed] — local enrichment/registries/oui36.csv

Registry / block sizes

one MA-L (24-bit OUI) plus twelve MA-M (28-bit) blocks [Confirmed] — local registry CSVs. NOTE: IEEE public OUI data publishes NO assignment/registration date; any "date registered" on third-party tools is a database artifact, not an IEEE fact.

Broader MA-L footprint

third-party lookup sites list ~15 MA-L prefixes (e.g. C0:9F:51, 04:71:53, 98:2C:C6, 7C:13:1D, D0:B6:6F, 74:06:35, 58:76:AC, F4:23:9C, E0:E8:05, A0:95:7F, 48:3E:5E, C4:0F:A6, 78:B3:9F, 0C:67:14) for the same registered name, but only D8:21:DA is confirmed in the local MA-L cache [Likely] — maclookup.app/vendors/sernet-suzhou-technologies-corporation, udger.com

HQ / country

No. 8 Tangzhuang Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province, China 215021; country CN [Confirmed] — local enrichment/registries/mam.csv (address consistent across all MA-M rows); corroborated by maclookup.app

Company status

active manufacturing/export entity (no public consumer-facing brand site located) [Likely] — panjiva.com/Sernet-Suzhou-Technologies-Corp/1280416

Device types

OEM/ODM consumer and SOHO networking hardware — wireless routers, modem-routers, USB Wi-Fi adapters, VoIP gateways, IP cameras (wired and Wi-Fi), NAS/network storage, ADSL routers, access points [Confirmed] — matchory.com/supplier/sernet-suzhou-technologies, panjiva.com

OEM customers

NETGEAR and ARRIS appear in trade records as receiving parties; Extreme Networks also appears [Likely] — panjiva.com, matchory.com (trade-record inference, single class of source)

Vendor website

none confirmed for this entity; trade data references www.sercomm.com, which is Sercomm Corporation (a distinct Taiwanese ODM), not this company [Likely] — panjiva.com

Security context

no CVEs or advisories attributed to SERNET Suzhou hardware in this research pass; the device categories it builds (IP cameras, SOHO routers, NAS) are a historically high-CVE segment, but no firmware CVE traced to SERNET Suzhou branding was found [Likely] — cve.report/vendor/sernet, nvd.nist.gov

Disambiguation (critical)

SerNet GmbH (sernet.de, Göttingen, Germany) is a separate information-security software/VAR firm with NO MAC OUI registrations; CVE-2021-36981 (verinice, insecure Java deserialization) belongs to SerNet GmbH, NOT this OUI holder [Confirmed] — sernet.de/en, cve.report/vendor/sernet

Allocated date

Unknown — IEEE publishes no registration dates for MAC/OUI assignments; third-party per-prefix "date registered" values are database artifacts [Confirmed] — IEEE OUI data schema (Registry, Assignment, Organization Name, Organization Address only)