Samsung Electro-Mechanics Co., Ltd. — 18 prefixes (MA-L)

Samsung Electro-Mechanics Co., Ltd. (SEMCO, Korean 삼성전기) holds 18 MA-L (24-bit OUI) blocks in the IEEE registry, all registered to "SAMSUNG ELECTRO MECHANICS CO., LTD." at 314 Maetan3-Dong, Yeongtong-Gu, Suwon, Gyeonggi-do, South Korea 443-743. SEMCO is a publicly traded (KRX: 009150) Samsung Group subsidiary founded in 1973 and headquartered in Suwon — a substantive, verifiable company, not a bare single-OUI registrant. Its core businesses are multilayer ceramic capacitors (MLCCs), semiconductor package substrates (FC-BGA), and camera/lens modules, but the OUI footprint specifically traces to its Wi-Fi Combo Module product line (2.4/5 GHz, IEEE 802.11 a/b/g/n/ac) marketed for smartphones, tablets, notebook PCs, and home appliances — explaining why this registrant's MACs surface on networked consumer devices. This entry is a distinct legal entity from two other Samsung-family OUI registrants already tracked separately in this project: vendor-samsung-electronics (Samsung Electronics Co., Ltd., ~884 MA-L, the parent's own end-product assignments) and vendor-samsung-electro-mechanicsthailand (the Thailand manufacturing subsidiary, 34 MA-L, a separate registry entity). No CVEs, botnet activity, or default-credential advisories were found tied specifically to this OUI; the only public chatter is ordinary consumer "unknown device on my network" forum threads, which is not a security signal on its own.

IEEE assignment

18 prefixes → SAMSUNG ELECTRO MECHANICS CO., LTD., registered Suwon, Gyeonggi-do, KR [Confirmed] — the IEEE MA-L registry; the Wireshark manufacturer database

Registry / block size

MA-L (24-bit OUI); 18 IEEE prefixes (~302.0M addresses); no MA-M or MA-S blocks found for this entity [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

HQ / country

314 Maetan3-Dong (also transliterated Metan-dong/Metan3-dong), Yeongtong-Gu, Suwon, Gyeonggi-do, KR 443-743 [Confirmed] — the IEEE MA-L registry. NOTE: 6 of the 18 registry rows (5C:A3:9D, 38:AA:3C, FC:1F:19, DC:71:44, 5C:0A:5B, CC:3A:61) show country code US for this same Suwon, South Korea address — a data artifact, not a second location, consistent with the same class of artifact already documented on the sibling Thailand entry.

Company status

active, publicly traded (KRX: 009150), Samsung Group subsidiary, founded 1973 [Confirmed] — https://en.wikipedia.org/wiki/Samsung_Electro-Mechanics; https://www.samsungsem.com

Parent / group

Samsung Group; distinct legal entity from vendor-samsung-electronics (Samsung Electronics Co., Ltd.) and vendor-samsung-electro-mechanicsthailand (Samsung Electro-Mechanics(Thailand) subsidiary)

[Confirmed] — https://www.netify.ai/resources/macs/brands/samsung; /mac/vendor/samsung-electro-mechanicsthailand/

Device types

Wi-Fi Combo Modules (2.4/5 GHz, IEEE 802.11 a/b/g/n/ac) embedded in smartphones, tablets, notebook PCs, and home appliances; also MLCCs, semiconductor package substrates, and camera/lens modules (component business, not directly MAC-bearing)

[Confirmed] — https://samsungsem.com/global/product/module/communication-module.do

Verified sample prefixes (all MA-L)

00:02:78, 00:21:19, 00:26:37, 20:64:32, A0:0B:BA, B4:07:F9 [Confirmed] — the IEEE MA-L registry

Allocated date

Unknown/null — IEEE's the IEEE MA-L registry publishes no date column (only Registry, Assignment, Organization Name, Organization Address); third-party "date registered" markers (e.g. maclookup.app's 2000/2019/per-prefix dates) are database ingestion artifacts, not IEEE facts, and are not recorded here

[Unknown] — no first-party source

IANA reference

none applicable — IANA governs protocol parameters, not IEEE OUI/MA-L blocks; column stays blank [Confirmed] — IANA scope

Analyst note

A globally-administered MAC in one of these 18 ranges most plausibly indicates a Samsung-ecosystem Wi-Fi-connected consumer device (phone, tablet, notebook, appliance) using a SEMCO-supplied combo module, not enterprise/server networking hardware. No CVEs or abuse signals specific to this OUI surfaced in research.

[Likely] — https://www.snbforums.com/threads/is-this-someone-trying-to-connect-to-my-router.17248/