Cabletron Systems, Inc. — 5 prefixes (MA-L)

Cabletron Systems holds five MA-L (24-bit OUI) blocks in the IEEE registry — 00:00:1D, 00:20:D4, 00:60:BB, 00:E0:3A, and 00:E0:63 — all registered to "Cabletron Systems, Inc." at 35 Industrial Way, Rochester, NH (the registry records the address in three slightly different forms, including a plain typo, "ROHESTER," on the 00:20:D4 row, and a "BLDG. #36" suffix on 00:E0:3A). Founded in 1983 by Craig Benson and Robert Levine, Cabletron grew into one of the largest enterprise networking vendors of the 1990s, employing roughly 6,600 people and topping $1 billion in annual sales by 1996, shipping Ethernet transceivers (the ST-500, notable for adding diagnostic LEDs), 10BASE5 test gear, modular Ethernet/Token Ring/FDDI/ATM hubs (the MMAC-8 chassis), the SmartSwitch line of LAN switches and routers, and the SPECTRUM/Prism network-management software suites. The company did not survive as a single entity: a 2000 reorganization split it into four spinoffs — Enterasys Networks (the core switching/routing line), Riverstone Networks, Aprisma Management Technologies, and Global Network Technology Services. Enterasys itself went private in 2006, was absorbed into Siemens Enterprise Communications in 2008, and was ultimately acquired by Extreme Networks in 2013 for $180 million, closing out the Cabletron lineage. All five OUI blocks predate that breakup and reliably identify original 1980s–1990s Cabletron-branded hardware, now decades past end-of-life.

IEEE assignment

5 MA-L prefixes → Cabletron Systems, Inc. [Confirmed] — IEEE MA-L

Registry / block size

MA-L (24-bit OUI); 5 prefixes; no MA-M or MA-S (OUI-36) assignments found for this org [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry. 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); any "date registered" on third-party lookup tools is a database artifact, not an IEEE fact — none is recorded here.

HQ / registry address

35 Industrial Way, Rochester, NH 03866-5005 (also printed as 03867 and with a "BLDG. #36" suffix on separate rows); the 00:20:D4 row contains a registry typo, "ROHESTER," reproduced as printed rather than corrected [Confirmed] — IEEE MA-L

Company status

defunct as a standalone company; a 2000 reorganization split Cabletron into four spinoffs (Enterasys Networks, Riverstone Networks, Aprisma Management Technologies, Global Network Technology Services); Enterasys went private in 2006, was absorbed into Siemens Enterprise Communications in 2008, and was acquired by Extreme Networks in 2013 for $180M

[Confirmed] — en.wikipedia.org/wiki/Cabletron_Systems

Founded

1983 by Craig Benson and Robert Levine [Confirmed] — en.wikipedia.org/wiki/Cabletron_Systems

Device types

Ethernet transceivers (ST-500), 10BASE5 test equipment (LAN-MD), modular Ethernet/Token Ring/FDDI/ATM hubs (MMAC-8), SmartSwitch LAN switches and routers (SmartSwitch 2200/9000, SmartSwitch Router 8000), SPECTRUM/Prism network-management software [Confirmed] — en.wikipedia.org/wiki/Cabletron_Systems

Verified prefixes (all MA-L, Cabletron Systems, Inc.)

00:00:1D, 00:20:D4, 00:60:BB, 00:E0:3A, 00:E0:63 [Confirmed] — IEEE MA-L

Security note

CVE-1999-1548 documents a denial-of-service in Cabletron SmartSwitch Router (SSR) 8000 firmware 2.x — the device can only process ~200 ARP requests/sec, so a flood above that rate causes DoS [Confirmed] — cvedetails.com/cve/CVE-1999-1548. Third-party aggregators also list factory-default credentials for SmartSwitch/router product lines, typical of the era's hub/switch gear; no authoritative vendor advisory page exists since the company is defunct

[Likely, single-source aggregator] — redoracle.com/PasswordDB/cabletron.html

Analyst note

a Cabletron OUI on a globally-administered address identifies original 1980s–1990s hardware from a company that hasn't existed in its own right since 2000; any such device found in production is almost certainly end-of-life and unpatched, and should be flagged for replacement.