ADC Codenoll Technology Corp. — 2 prefixes (MA-L)

ADC Codenoll Technology Corp. is the IEEE-registered name for what was originally Codenoll Technology Corporation, a Yonkers, New York maker of fiber-optic local-area-network equipment. The company designed and built networking hardware around fiber-optic, semiconductor, and optoelectronic technology — fiber-optic Ethernet transceivers, 10/100 Mbps Fast Ethernet NICs (PCI, RJ-45), active and passive network interface cards, fiber repeaters, hubs, and switches, much of it sold under the "CodeNet" brand, plus FDDI gear. Codenoll also published the 467-page *Fiber Optic LAN Handbook* (1991) and held patents on optical connectors, star-couplers, and photodetectors. ADC Telecommunications of Eden Prairie, Minnesota acquired a 50% stake in Codenoll in the mid-1990s, and the subsidiary was listed under the ADC Codenoll name in ADC's 1998 SEC filings — which is the name carried on the IEEE registry. The vendor holds two MA-L blocks: 00:00:4A (an early 00:00:xx-range allocation) and 00:80:DF. Both are registered to the 200 Corporate Blvd. South, Yonkers, NY 10701 address; the earlier standalone Codenoll address was 1086 North Broadway, Yonkers. The brand is now defunct — ADC Telecommunications was later acquired by Tyco Electronics and then CommScope. A data-quality note: third-party MAC-lookup sites report "1998-04-22" as the registration date for both blocks, but this is a database artifact, not an IEEE-published date — IEEE publishes no OUI registration dates. The 00:00:4A block's position in the low 00:00:xx Ethernet range predates that artifact. No CVEs or security advisories are associated with these legacy 1990s LAN devices.

IEEE assignment

2 prefixes → ADC CODENOLL TECHNOLOGY CORP., 200 Corporate Blvd. So., Yonkers, NY, US 10701 [Confirmed] — IEEE MA-L (lines 6446, 30152)

Registry / block size

MA-L (24-bit OUI); holds 2 IEEE prefixes [Confirmed] — IEEE MA-L. NOTE: IEEE's public OUI data publishes NO assignment/registration date (the IEEE MA-L registry columns are only Registry, Assignment, Organization Name, Organization Address); the "1998-04-22" on third-party tools (maclookup.app, hwaddress.com) is a database artifact, not an IEEE fact.

Verified prefixes (both MA-L, ADC Codenoll Technology Corp.)

00:00:4A, 00:80:DF [Confirmed] — IEEE MA-L / hwaddress.com / maclookup.app

HQ / country

200 Corporate Blvd. South, Yonkers, NY 10701, US (registry address); earlier standalone-Codenoll address was 1086 North Broadway, Yonkers, NY 10701 [Confirmed] — IEEE MA-L / hwaddress.com

Company status

defunct (brand absorbed; ADC Telecommunications → Tyco Electronics → CommScope) [Confirmed] — fundinguniverse.com, encyclopedia.com

Also known as

formerly Codenoll Technology Corporation; ADC Telecommunications acquired a 50% stake, after which the subsidiary operated under the ADC Codenoll name [Confirmed] — Gale (GALE|A18350238), fundinguniverse.com

Device types

fiber-optic Ethernet transceivers (e.g. CodeNet 3030C), 10/100 Mbps Fast Ethernet NICs (e.g. CODENET-7568, PCI/RJ-45), active & passive Ethernet NICs, fiber-optic repeaters, Fast Ethernet hubs & switches (CodeNet Centaur line), FDDI gear [Confirmed] — stason.org TULARC, ebay listing, Gale

Notable products

CodeNet fiber-optic Ethernet line; *Fiber Optic LAN Handbook* (1991, 467 pp.) [Confirmed] — archive.org (fiberopticlanhan0000code)

Security context

no CVEs or known exploits for ADC Codenoll / Codenoll products; legacy 1990s LAN infrastructure, all end-of-life; no active vendor advisory channel (brand defunct) [Confirmed] — no CVE found

Vendor website

none current (brand defunct); parent lineage now CommScope [Confirmed] — commscope.com/adc-krone

Allocated date

Unknown — IEEE publishes no OUI registration date; not fabricating the third-party "1998-04-22" artifact [Unknown] — IEEE MA-L

Analyst note

a 00:00:4A or 00:80:DF OUI identifies genuine legacy Codenoll/ADC Codenoll fiber-LAN hardware; expect these only in legacy or industrial environments, not modern networks.