Chengdu Quanjing Intelligent Technology Co., Ltd holds four IEEE MA-L blocks — E0:EF:02, 58:18:B4, EC:31:4A, and 34:47:D4 — together covering roughly 67 million addresses, a footprint that points to active hardware production at some volume rather than a one-off registration. A naming quirk worth flagging for anyone classifying these MACs: despite "Chengdu" in the company brand, every one of the four registry rows carries an identical address in Shenzhen's Nanshan District (Building A2, Chi Yuen Technology Park), not Chengdu. The slug "chengdu-quanjing-electronic" sometimes seen in third-party indexes does not match the registry; the authoritative IEEE-registered name is "Intelligent Technology," and all major OUI mirrors (maclookup.app, hwaddress.com, udger, rst.im) agree on it. Beyond the registry the trail goes cold: one product code, "T905PRO," appears in a device index consistent with consumer/IoT electronics, but the detail page returned HTTP 403 and no product category, vendor website, or FCC filing under "Quanjing" could be confirmed from primary sources. There are no known CVEs, breaches, or botnet reports tied to this specific vendor. As always with OUI data, IEEE publishes no registration dates; the per-prefix "date registered" values shown by third-party lookup tools (e.g. 2022-04-28 for E0:EF:02) are database artifacts, not IEEE facts, and must not be presented as registration dates.
- IEEE assignment
- 4 prefixes → Chengdu Quanjing Intelligent Technology Co., Ltd [Confirmed] — IEEE oui.csv (lines 532, 23544, 30319, 31785); maclookup.app, hwaddress.com, udger, rst.im concur
- Registry / block size
- MA-L (24-bit OUI); 4 prefixes (~67.1M addresses across 4 blocks) [Confirmed] — IEEE MA-L / maclookup.app. 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 (all MA-L)
- E0:EF:02, 58:18:B4, EC:31:4A, 34:47:D4 [Confirmed] — IEEE oui.csv; maclookup.app, udger
- Registered address
- Building A2, Chi Yuen Technology Park, 1001 College Avenue, Nanshan District, Shenzhen, Guangdong 518000, China (registry address — Shenzhen, NOT Chengdu, despite the brand name) [Confirmed] — IEEE oui.csv; hwaddress.com, udger
- Country
- CN (China) [Confirmed] — IEEE oui.csv
- Name note
- Authoritative IEEE-registered name is "Chengdu Quanjing Intelligent Technology Co., Ltd" — not "Electronic." All OUI registry mirrors agree. [Confirmed] — maclookup.app, hwaddress.com, udger, rst.im
- MA-M / MA-S presence
- None — no entries found in mam.csv (MA-M) or oui36.csv (MA-S) for this vendor [Confirmed] — IEEE cached registries
- Company status
- Unknown — no official vendor website found; quanjing.com is an unrelated Beijing stock-image platform [Likely] — quanjing.com (different entity)
- Device types
- Unknown — one model code "T905PRO" indexed at device.report (consistent with consumer/IoT hardware) but detail page returned HTTP 403; no product category confirmable from a primary source [Unknown] — device.report (403)
- FCC filings
- None found under "Quanjing" in fccid.io / fcc.report searches [Unknown — absence of result, not a confirmed negative]
- Security context
- No CVEs, breaches, malware, botnet, or Shodan-exposure reports found specifically for this vendor [Unknown] — open-source search; class-level Chinese-IoT risk research (arxiv 2505.09929) does not name this vendor
- Allocated date
- Unknown — IEEE publishes no registration dates for MA-L assignments; third-party dates are artifacts [Unknown by design]
- Analyst note
- The 4-block MA-L footprint (~67M addresses) implies meaningful device volume, but device category, market, and security posture are all unconfirmed from primary sources. An E0:EF:02 / 58:18:B4 / EC:31:4A / 34:47:D4 OUI on a globally-administered address identifies this vendor's hardware; the device type behind it cannot be inferred from the OUI alone.