4RF Communications Ltd — 00-22-B2 (MA-L)

4RF Communications Ltd is a Wellington, New Zealand manufacturer founded in 1998, best known for narrowband point-to-point and point-to-multipoint SCADA/telemetry radios and LTE/5G routers sold into critical-infrastructure sectors — utilities, oil and gas, mining, public safety, and military — across more than 150 countries. Its flagship Aprisa SR/SR+/SRi radio family carries Ethernet and serial interfaces (the SR+ variant offers up to four build-configurable ports) and documents security features including AES link encryption, RADIUS-based authentication, and MAC address filtering, which makes a discovered 4RF MAC a meaningful asset-identification signal on industrial/OT networks. In July 2024, 4RF was acquired by Aviat Networks; 4rf.com now redirects to aviatnetworks.com, where the product line continues under the Aviat brand. IEEE's public MA-L registry records a single confirmed OUI, 00-22-B2, registered to "4RF Communications Ltd" at the company's Wellington address. A third-party Wireshark the Wireshark manufacturer database lists two additional /36 blocks attributed to the same org name, but neither could be corroborated in this project's own cached IEEE MA-S snapshot, so they are reported as unconfirmed rather than recorded as verified assignments.

IEEE assignment

00-22-B2 → 4RF Communications Ltd [Confirmed] — the IEEE MA-L registry

Registry / block size

MA-L (24-bit OUI); one confirmed block in the cached snapshot [Confirmed] — the IEEE MA-L registry

HQ / registered address

26 Glover Street, Ngauranga, Wellington, NZ 6031 [Confirmed] — the IEEE MA-L registry

Company background

founded 1998, NZ manufacturer of SCADA/critical-infrastructure radios and LTE/5G routers, active in 150+ countries [Confirmed] — https://www.prnewswire.com/news-releases/aviat-networks-acquires-4rf-a-leading-provider-of-industrial-wireless-access-solutions-for-critical-infrastructure-302188619.html, https://aviatnetworks.com/about

Company status

active, now operating as part of Aviat Networks following the July 2024 acquisition; 4rf.com redirects to aviatnetworks.com [Confirmed] — https://investors.aviatnetworks.com/news-releases/news-release-details/aviat-networks-acquires-4rf-leading-provider-industrial-wireless

Device types / notable products

Aprisa SR / SR+ / SRi narrowband point-to-point and point-to-multipoint SCADA/telemetry radios (2 Ethernet + 1 serial port on SR; up to 4 build-configurable ports on SR+) [Confirmed] — https://aviatnetworks.com/products/aprisa-sr/

Security context

vendor-documented AES link encryption, authentication/address filtering, RADIUS support on the Aprisa SR/SR+ line [Confirmed] — https://aviatnetworks.com/products/aprisa-sr/

CVE/advisory search

no 4RF/Aprisa-specific CVE identified; only generic CISA weekly-bulletin index and vendor marketing pages surfaced — absence of a hit is not proof of absence [Unknown, sourced null] — no citation (negative search result)

Additional /36 blocks (00

50:C2:2E:D0/36, 00:50:C2:6B:30/36): claimed for "4RF Communications Ltd" in the Wireshark the Wireshark manufacturer database DB but NOT found in this project's cached the IEEE MA-S registry (MA-S) snapshot — not recorded as verified IEEE assignments

[Likely, unconfirmed] — the Wireshark manufacturer database, the Wireshark manufacturer database, the Wireshark manufacturer database

MA-M / MA-S registry check

no the IEEE MA-M registry or the IEEE MA-S registry rows found for this organization in the cached registries [Confirmed] — the IEEE MA-M registry, the IEEE MA-S registry

Assignment/registration date

not available — IEEE's public OUI data publishes no assignment/registration date field; none fabricated [Unknown] — the IEEE MA-L registry

Related vendors

Aviat Networks (parent company since the July 2024 acquisition) [Confirmed] — https://www.prnewswire.com/news-releases/aviat-networks-acquires-4rf-a-leading-provider-of-industrial-wireless-access-solutions-for-critical-infrastructure-302188619.html

Analyst note

a 4RF/00-22-B2 MAC on a network is a strong OT/SCADA asset-identification signal given the vendor's critical-infrastructure focus; the two additional /36 claims should not be treated as confirmed until sourced from an authoritative IEEE MA-S snapshot directly.