Calxeda, Inc. — 2 prefixes (MA-L)

A MAC address starting with 74:CA:25 or FC:2F:40 belongs to Calxeda, Inc., a defunct Austin, Texas semiconductor startup that designed ARM-based server system-on-chip (SoC) processors. Both blocks are 24-bit MA-L registrations under the same legal name and Austin address, and hardware carrying either prefix is Calxeda-manufactured networking silicon rather than a shared or third-party allocation.

Calxeda was founded in 2008 as Smooth-Stone and renamed Calxeda in 2010. Its flagship EnergyCore ECX-1000 SoC, announced November 2011, packed four ARMv7 Cortex-A9 cores at 1.1-1.4GHz drawing roughly 1.5W per core and 5W per server node — an early low-power ARM server play.

Hewlett-Packard integrated Calxeda silicon into its Project Moonshot cartridge servers, announced November 2011, and UK vendor Boston Limited shipped Calxeda-based Viridis appliances, demonstrated November 2012. Calxeda reportedly followed with a second-generation EnergyCore ECX-2000 SoC (codenamed Midway), though that detail comes from a single web-research pass and is not independently confirmed.

Calxeda began restructuring on December 19, 2013 after failing to close a follow-on funding deal with HP, and ceased independent operation shortly after. Its intellectual property resurfaced under a company called Silver Lining Systems in December 2014. No CVE is recorded in the NVD specifically tied to Calxeda hardware, as of an August 2026 search.

IEEE assignment

74:CA:25, FC:2F:40 → Calxeda, Inc., registered Austin, TX, US [Confirmed] — the IEEE MA-L registry (74CA25), the IEEE MA-L registry (FC2F40)

Registry / block size

MA-L (24-bit OUI); 2 IEEE prefixes, same registrant/address [Confirmed] — the IEEE MA-L registry (74CA25, FC2F40)

HQ / country

7000 North Mopac Expressway, Austin, TX 78731, US [Confirmed] — the IEEE MA-L registry (74CA25, FC2F40)

MAM / oui36 cross-check

no additional Calxeda MA-M or MA-S registrations found [Confirmed] — the IEEE MA-M registry (searched, no match); the IEEE MA-S registry (searched, no match)

Company status

defunct — restructuring reported December 19, 2013 after failing to close a follow-on deal with HP; IP resurfaced under Silver Lining Systems, December 2014 [Confirmed] — https://en.wikipedia.org/wiki/Calxeda

Founding

founded 2008 as "Smooth-Stone", renamed Calxeda in 2010 [Confirmed] — https://en.wikipedia.org/wiki/Calxeda

Device types

ARM server SoC, EnergyCore ECX-1000 (announced Nov 2011; four ARMv7 Cortex-A9 cores, 1.1-1.4GHz, ~1.5W/core, 5W/node) [Confirmed] — https://en.wikipedia.org/wiki/Calxeda

Second-gen product

EnergyCore ECX-2000 ("Midway") reportedly followed ECX-1000 [Likely, single-source] — W1-web research angle notes; not corroborated by Wikipedia

Notable deployments

HP Project Moonshot cartridge servers (announced Nov 2011); Boston Limited Viridis appliances (demonstrated Nov 2012) [Confirmed] — https://en.wikipedia.org/wiki/Calxeda

Registration date

Unknown — IEEE's public OUI registry publishes no assignment/registration date for either block [Unknown] — the IEEE MA-L registry

Security context

No CVE recorded in the NVD specifically attributed to Calxeda hardware, as of an August 2026 search [Confirmed absence] — W1-web research angle (NVD search)

Related vendors

HP (Project Moonshot integrator), Boston Limited (Viridis integrator) — customers/integrators, not affiliated companies [Confirmed] — https://en.wikipedia.org/wiki/Calxeda

Analyst note

74:CA:25 and FC:2F:40 are Calxeda's own MA-L blocks, not a shared IEEE base, so either prefix reliably indicates Calxeda-manufactured hardware; the company folded in 2013, so matching devices are legacy/decommissioned data-center gear rather than current production.