The MA-L block 64:4C:69 is registered to CONPROVE, a Brazilian manufacturer of high-precision test, monitoring, and simulation equipment for the electrical power sector, based in Uberlândia, Minas Gerais. Conprove's Ethernet interfaces are not found in consumer or enterprise networking gear; they are embedded in operational-technology (OT/ICS) field instruments used to commission and maintain digital substations. The product line centers on protection-relay and automation testers — the CE-6710, CE-6707, and CE-7012 universal/substation test sets — plus dedicated IEC 61850 network tooling: the rack-mount CE-RNET4 monitor (4× SFP 1 Gbps, PTP-capable), the portable CE-MNET4 tester, the CE-TAP1 Ethernet TAP for passively capturing substation traffic, and the CE-SYNC NET PTP profile converter. These devices speak GOOSE, Sampled Values, MMS, and PTP (IEEE 1588), and are intended for commissioning and maintenance rather than permanent inline deployment. For asset classification this means a 64:4C:69 address inside a substation context is consistent with test or monitoring activity; the same MAC appearing on a general-purpose IT enterprise network, outside any substation context, is anomalous and worth investigating. No public CVEs or CISA ICS advisories were found for Conprove devices as of June 2026. As with every IEEE OUI, no registration date is published by IEEE — third-party "date registered" values (such as the "27 June 2023" shown by maclookup.app) are database artifacts, not IEEE-sourced facts, and must not be presented as an IEEE registration date.
- IEEE assignment
- 64:4C:69 → CONPROVE [Confirmed] — IEEE oui.csv (MA-L block; P:\networklookup\enrichment\registries\oui.csv, line 27), maclookup.app
- Registry / block size
- MA-L (24-bit OUI; ~16.77M addresses). Single block; not present in mam.csv (MA-M) or oui36.csv (MA-S). [Confirmed] — IEEE oui.csv, https://maclookup.app/vendors/conprove. NOTE: IEEE's public OUI data publishes NO assignment/registration date; the maclookup.app "27 June 2023" value is a database artifact, not an IEEE fact, and must not be surfaced as an IEEE registration date.
- Registry address / country
- 75, Visconde de Ouro Preto St., Uberlândia, Minas Gerais, BR 38405-202 (registry address); Brazil (BR) [Confirmed] — IEEE oui.csv
- Company
- Conprove Engenharia Ltda — Brazilian manufacturer of high-precision test, monitoring, and simulation equipment for the electrical power sector [Confirmed] — https://conprove.com/en/
- Company status / founded
- active; self-described "in the market since 1984" [Likely — single-source, company self-description] — https://conprove.com/en/
- Device types
- OT/ICS field test and monitoring instruments with embedded Ethernet interfaces for IEC 61850 substations — not consumer or enterprise networking hardware [Confirmed] — https://conprove.com/en/all-products/
- Notable products
- CE-RNET4 (rack-mount IEC 61850 network monitor/tester, 4× SFP 1 Gbps + SFP PTP + 2× RJ45), CE-MNET4 (portable IEC 61850 network tester), CE-6710 / CE-6707 (universal protection/automation testers), CE-7012 (substation systems tester), CE-TAP1 (Ethernet TAP for IEC 61850 capture), CE-SYNC NET (PTP profile converter). Primary test sets support GOOSE, Sampled Values (SV), MMS, and PTP (IEEE 1588). [Confirmed] — https://conprove.com/en/all-products/, https://conprove.com/en/products/03-0-ce-mnet4-digital-test-set-analizer-for-iec-61850-systems/
- Security context
- No public CVEs, CISA ICS advisories, or known exploit disclosures found for Conprove devices as of June 2026. Devices operate in electric-power critical infrastructure (IEC 61850 substations). A 64:4C:69 MAC in a substation context is consistent with commissioning/maintenance test gear (CE-MNET4, CE-6710, CE-7012), permanent monitoring hardware (CE-RNET4), or a passive Ethernet TAP (CE-TAP1); persistent presence on an IT enterprise network outside a substation context is anomalous and worth investigating. No threat-actor association or weaponized exploit found. [Confirmed — absence of CVEs as of June 2026; analyst guidance] — https://conprove.com/en/power-system-communication-testing/network-monitoring-in-digital-substations/
- Analyst note
- Conprove is not a network-equipment vendor; its Ethernet appears on portable and rack-mount OT test instruments. Treat 64:4C:69 as substation test/monitoring gear; flag it as anomalous on general-purpose IT networks.