Cofractal, Inc. — E4:DC:5F (MA-L)

Cofractal, Inc. holds the MA-L OUI block E4:DC:5F, registered in the IEEE the IEEE MA-L registry to a Sunnyvale, California mailbox address (209 E Java Dr. #61593, Sunnyvale, CA 94089, US). Unlike consumer-electronics OUI holders, Cofractal is not a recognized hardware brand: its primary public identity is as an independent US network operator and ISP running AS26073, with global peering across North American and European internet exchanges, an open peering policy, and upstream transit via Cogent Communications and Hurricane Electric. IPinfo classifies the ASN as "ISP, Business or Hosting," and the company also fronts a cloud platform at cloud.cofractal.com behind a login wall. Because the OUI is an MA-L (24-bit, ~16 million addresses) and no public product catalog or hardware datasheet is reachable — cofractal.com returned an HTTP 523 Cloudflare error during research — the most defensible reading is that E4:DC:5F addresses belong to Cofractal's own infrastructure (routers, network appliances, virtual-machine NICs) rather than to any retail device line. The specific device category cannot be confirmed from public sources and is left Unknown rather than guessed. IEEE publishes no allocation date for OUI registrations, so any "date registered" figure surfaced by third-party MAC-lookup databases is a database artifact, not an authoritative registration date.

IEEE assignment

E4:DC:5F → Cofractal, Inc. [Confirmed] — IEEE the IEEE MA-L registry (MA-L), row 934; maclookup.app/vendors/cofractal-inc

Registry / block size

MA-L (24-bit OUI; ~16M addresses) [Confirmed] — IEEE the IEEE MA-L registry. Not present in the IEEE MA-M registry (MA-M) or the IEEE MA-S registry (MA-S) — single MA-L block only.

Registered address / country

209 E Java Dr. #61593, Sunnyvale, CA 94089, US (registry mailbox address) [Confirmed] — IEEE the IEEE MA-L registry (MA-L)

Company status

active independent network operator / ISP; runs AS26073 [Confirmed] — ipinfo.io/AS26073, peeringdb.com/asn/26073, bgp.he.net/AS26073

Company description

US-based ISP / transit network and cloud-services provider; ~4,864 IPv4 addresses on AS26073, global peering (NA + EU IXPs), open peering policy, upstreams Cogent + Hurricane Electric; IPinfo class "ISP, Business or Hosting"

[Confirmed] — ipinfo.io/AS26073, peeringdb.com/asn/26073, bgp.he.net/AS26073

Device types

Unknown — no public evidence of manufactured end-user hardware. MA-L block is consistent with internal infrastructure (routers, network appliances, virtual NICs) operated within Cofractal's own network, but no product catalog/datasheet is publicly reachable (cofractal.com HTTP 523; cloud.cofractal.com login-walled)

[Unknown] — maclookup.app/vendors/cofractal-inc, bgp.he.net/AS26073, peeringdb.com/asn/26073

Registration date

none published by IEEE. Third-party MAC databases cite "2021-04-20," but that is a database artifact, not an IEEE fact — treat as approximate only [Likely (artifact, not authoritative)] — maclookup.app/vendors/cofractal-inc

No-IEEE-date note

IEEE public OUI data (the IEEE MA-L registry columns: Registry, Assignment, Organization Name, Organization Address) contains NO assignment/registration date. Any "date registered" from a lookup tool is a third-party database artifact. [Confirmed] — standards-oui.ieee.org/oui/oui.csv

Related identifier

ASN 26073 (Cofractal's autonomous system) [Confirmed] — bgp.he.net/AS26073, peeringdb.com/asn/26073

Analyst / security note

Low public footprint. E4:DC:5F MACs most plausibly identify Cofractal's own internal network infrastructure rather than consumer devices. No known CVEs, abuse reports, or security advisories tied to Cofractal hardware. IPinfo notes VPN traffic on AS26073, an expected signal for a hosting/transit ASN, not an indicator of malicious use.

[Likely] — ipinfo.io/AS26073, bgp.he.net/AS26073