4NSYS Co. Ltd. — 00:18:7B (MA-L)
Summary
- // what this is
- 4NSYS is registered to MAC prefix
00:18:7Bin the IEEE OUI database. When a device's MAC address begins with00:18:7B, that block was registered by 4NSYS — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- Single-OUI registrant corroborated as a Seoul-based DVR/NVR and IP-camera manufacturer via independent company-directory listings; treat as a niche CCTV-hardware vendor rather than a shell registration.
About this vendor.
A MAC address starting with 00:18:7B belongs to 4NSYS Co. Ltd., a Seoul, South Korea-based video-surveillance electronics manufacturer, and typically shows up on DVR/NVR recorders, IP cameras, or video-encoding ASIC-based hardware rather than general-purpose networking gear.
Independent company-directory listings (asmag.com, sourcesecurity.com, ec21.com) describe 4NSYS as founded in 1991, credited with developing a moving-picture-compression ASIC chip in Korea in 1998 and a set-top-box-type DVR in 2000. Its listed product line covers DVR/NVR systems, IP/web cameras, and video-encoding ASIC components for the CCTV market. The vendor's own storefront returned HTTP 403 on fetch, so this profile rests on third-party directory corroboration rather than the company's primary site.
The IEEE registry footprint is narrow: only one block, 00:18:7B (MA-L, 24-bit), is registered to this organization. No MA-M (the IEEE MA-S registry) or MA-S (the IEEE MA-M registry) sub-allocation was found, so 4NSYS is a single-OUI vendor rather than a multi-prefix one.
No CVE naming 4NSYS is recorded in the NVD as of an August 2026 search. A single unverified CCTV forum post mentions a candidate default password for a 4NSYS unit that the poster reported did not work on their own device — not a vendor advisory or confirmed vulnerability, so no security association is asserted here.
- Registry block
- MA-L, single 24-bit OUI (00:18:7B); no MA-M or MA-S sub-block found
- IEEE assignment
- 00:18:7B → 4NSYS Co. Ltd., registered Seoul, KR [Confirmed] — the IEEE MA-L registry 00187B
- Registry / block size
- MA-L (24-bit OUI); single block, no MA-M or MA-S sub-allocation found for this organization [Confirmed] — the IEEE MA-L registry 00187B; the IEEE MA-M registry; the IEEE MA-S registry
- HQ / address
- 3F, Hana Bldg, Guro-Gu, Seoul, KR 152-100 [Confirmed] — the IEEE MA-L registry 00187B
- Country
- South Korea (KR) [Confirmed] — the IEEE MA-L registry 00187B
- Company substance
- identifiable, operating CCTV/surveillance electronics maker, not a bare shell registration [Confirmed] — asmag.com company profile, sourcesecurity.com company listing, ec21.com trade listing
- Founded
- 1991 [Likely] — asmag.com company profile
- Notable products
- moving-picture-compression ASIC chip developed in Korea (1998); set-top-box-type DVR (2000) [Likely] — asmag.com, sourcesecurity.com
- Device types
- DVR/NVR systems, IP/web cameras, video-encoding ASIC components [Confirmed] — asmag.com, sourcesecurity.com, ec21.com trade listing
- Third-party date caveat
- maclookup.app shows an "Initial registration" field for this prefix; IEEE's public the IEEE MA-L registry publishes no assignment/registration date, so no date is reported as an IEEE fact here [Confirmed] — https://maclookup.app/macaddress/00187B
- Security posture
- no CVE naming 4NSYS in the NVD as of an August 2026 search; a single unverified CCTV forum post about a candidate default password is noted but not treated as a confirmed vulnerability [Confirmed absence in NVD; Likely for the forum caveat] — https://nvd.nist.gov/vuln/detail/CVE-2018-9995, https://www.cctvforum.com/topic/47407-cannot-factory-reset-the-dvr/
- Official website
- not confirmed — the vendor's ec21.com storefront returned HTTP 403 on fetch [Unknown]
- Related vendors
- none identified [Unknown]