SHENZHEN BUL-TECH CO., LTD. — 2 prefixes (MA-L)

Shenzhen Bul-Tech Co., Ltd. is a small Shenzhen-based consumer-electronics OEM that holds two IEEE MA-L (24-bit) OUI blocks: the older 00:1D:2A and the newer 20:C8:B3, together covering roughly 33.6 million addresses. Both blocks register to the same company in Shenzhen, Guangdong, postal zone 518101, but with two different street addresses — the 00:1D:2A registration lists the 4/F COFCO Building in Bao'an District, while 20:C8:B3 lists No.59 Longjing 2nd Road — a typical sign that the firm relocated between the two registrations. The company's confirmed product line is short-range Bluetooth audio: its single FCC filing under grantee code Y54 (FCC ID Y54-BT323) is a 2.4 GHz Bluetooth headset operating at 2402–2480 MHz, and its Made-in-China showroom (under the "camstone" handle) markets multi-connecting Bluetooth headsets. From a security standpoint this is a low-concern vendor: the hardware is short-range consumer audio rather than network infrastructure, only one FCC filing is on record, and no CVEs or threat-intel references were found. A data-quality caution: third-party MAC databases show "registration dates" (2007-08-18 for 00:1D:2A, 2011-07-26 for 20:C8:B3), but IEEE publishes no OUI registration dates — these are scraper artifacts, not IEEE facts, and must not be treated as authoritative allocation dates.

IEEE assignment

2 prefixes → SHENZHEN BUL-TECH CO.,LTD., Shenzhen, Guangdong, CN [Confirmed] — IEEE MA-L

Registry / block size

MA-L (24-bit OUI), 2 blocks (~33.6M addresses combined); no MA-M or MA-S entries found [Confirmed] — the IEEE MA-L registry; https://maclookup.app/vendors/shenzhen-bul-tech-co-ltd. NOTE: IEEE's public OUI data publishes NO assignment/registration date; any "date registered" on third-party tools is a database artifact, not an IEEE fact.

Verified prefixes (both MA-L)

00:1D:2A (older; COFCO Building address), 20:C8:B3 (newer; Longjing 2nd Road address) [Confirmed] — the IEEE MA-L registry; https://maclookup.app/macaddress/001D2A

HQ / country

Primary — Area C, 4/F, No.59, Longjing 2nd Road, Shenzhen, Guangdong, CN 518101; older registration — 4/F COFCO Building, 3rd District, Bao'an District, Shenzhen, Guangdong, CN 518101 [Confirmed] — IEEE MA-L; https://fccid.io/Y54-BT323

Country

CN [Confirmed] — IEEE MA-L

Company status / founded

founded ~December 2010 per company self-description on Made-in-China; FCC grantee registration January 2011 [Likely] — https://www.made-in-china.com/showroom/camstone/; https://fccid.io/Y54-BT323

Device types

Bluetooth audio consumer electronics — specifically multi-connecting Bluetooth headsets [Confirmed] — https://fccid.io/Y54-BT323; https://www.made-in-china.com/showroom/camstone/

FCC grantee code

Y54; one confirmed filing FCC ID Y54-BT323 (2.4 GHz Part 15 Bluetooth headset, 2402–2480 MHz) [Confirmed] — https://fccid.io/Y54-BT323

Website

no public vendor site reachable/indexed; FCC contact email implies a bul-tech.com domain; Made-in-China "camstone" showroom is the de facto public profile [Likely] — https://fccid.io/Y54-BT323; https://www.made-in-china.com/showroom/camstone/

Security context

low concern — short-range Bluetooth audio peripheral, not network infrastructure; one FCC filing on record; no CVEs or threat-intel references found [Likely] — https://fccid.io/Y54-BT323

Registration-date caution

maclookup.app shows 2007-08-18 (00:1D:2A) and 2011-07-26 (20:C8:B3); these are third-party scraper artifacts, NOT IEEE-published dates, and must not be used as allocated_date [Confirmed] — https://maclookup.app/vendors/shenzhen-bul-tech-co-ltd