3B System Inc. — 00:0F:05 (MA-L)

A MAC address starting with 00:0F:05 belongs to 3B System Inc. (registered with IEEE as "3B SYSTEM INC."), a small South Korean electronics company headquartered in Daegu. The block is a single MA-L (/24) registration; no other OUI assignment under this or a related name was found in any current IEEE registry file.

The IEEE registry address on file (1727 Sankyuk2-dong, Buk-gu, Daegu) differs from the address in later, self-submitted B2B trade-directory profiles for the same company name (1097 Woram-dong, Dalseo-gu, Daegu). That pattern is consistent with an office relocation over the two-plus decades since registration rather than a mismatch between two unrelated firms.

Those directory profiles — mirrored across several Korean export-trade sites — describe 3B System as founded in 1999, with 11-50 employees and low-single-digit-million-dollar reported revenue, selling automated FPD/LCD vision-inspection equipment branded "Smart Vision Inspector," smart-card products, and an internet-connected pet feeder/monitor called "PetWatch." PetWatch is the most plausible source of any MAC-bearing hardware from this vendor, but no independent teardown, retailer listing, or review was found confirming it beyond the company's own self-submitted directory listings.

No security advisories, CVEs, or research reference this OUI, "3B System," or "PetWatch," and no source confirms whether the company is still operating. Its listed website (www.3bsystem.co.kr) did not resolve cleanly at verification time (TLS certificate error) — common for small, dormant, or rebranded firms, and not itself proof of closure.

IEEE assignment

00:0F:05 → 3B System Inc. (registered "3B SYSTEM INC."), Daegu, KR [Confirmed] — IEEE MA-L, the IEEE MA-L registry (key 000F05)

Registry / block size

MA-L (24-bit OUI); single /24 block, no other assignments found [Confirmed] — the IEEE MA-L registry, the IEEE MA-S registry, the IEEE MA-M registry

HQ / country

1727 Sankyuk2-dong, Buk-gu, Daegu 702-845, KR (registry address at registration); a later B2B directory profile lists a different Daegu address (1097 Woram-dong, Dalseo-gu) [Confirmed registry address; Likely later address] — the IEEE MA-L registry (key 000F05); 3bsystem.gobizkorea.com

Company status

unconfirmed whether still operating; listed website unreachable (TLS certificate error) at verification time [Unknown] — www.3bsystem.co.kr

Device types

vision-inspection equipment (Smart Vision Inspector), smart-card products, PetWatch pet feeder/monitor — self-reported by the vendor [Likely] — 3bsystem.en.ec21.com

Notable products

PetWatch (internet-connected pet feeder/monitor) — most plausible source of any MAC-bearing device, but not independently verified as shipped [Likely] — 3bsystem.en.ec21.com

Verified sample prefix

00:0F:05 (only known assignment) [Confirmed] — the IEEE MA-L registry (key 000F05)

Registration date

Unknown — IEEE's public OUI data publishes no assignment/registration date; maclookup.app's "12 February 2004" / "17 November 2015" dates are a third-party database artifact, not an IEEE fact [Confirmed absence of an IEEE date] — https://maclookup.app/macaddress/000F05

Related vendors

none known

Analyst note

A single-OUI South Korean vendor with a named, address-consistent (if relocated) company profile — founded 1999, self-reported product lines including a plausible MAC-bearing device (PetWatch) — but no independent corroboration of shipped hardware, no security history, and unconfirmed current operating status. Treat any 00:0F:05 sighting as this vendor's IEEE registration; don't assume a specific device class without additional context.