OUI 20:31:8D is assigned to GiaX GmbH, a broadband-access equipment vendor headquartered at Am Weichselgarten 7, 91058 Erlangen, Germany. The block is a standard MA-L (24-bit OUI, ~16 million addresses) and appears in the IEEE registry under the organization name "Giax GmbH"; it is found only in the MA-L file, not in the MA-M or MA-S registries, confirming a full 24-bit allocation. GiaX builds gigabit access infrastructure for coaxial-cable and fiber networks rather than consumer retail hardware. Its product lines include HelEOS (Gateway, Relay, and Switch nodes for 10G Ethernet over coax in Distributed Access Architecture, Remote PHY/Remote MAC-PHY, mobile backhaul, and distributed PON/FTTX deployments), IRIS (network controllers with 1–24 RF ports plus CPE such as modems and WLAN-enabled HomeNet gateways for MoCA Access gigabit-over-coax), and Atlas hardened distributed PON for fiber access. These devices are deployed by cable and broadband ISPs and multi-dwelling-unit operators — notably Vodafone Deutschland and several German regional ISPs — with a North American distribution agreement announced with Antronix. A MAC in this block therefore most likely belongs to an ISP-managed access node or subscriber CPE in a European (chiefly German) broadband network, not a generic consumer router. IEEE publishes no registration date for OUI blocks, so allocated_date is left null; the July 2022 date shown by third-party lookup tools is a database artifact, not an IEEE fact. No CVEs or public security advisories were found for GiaX products as of June 2026.
- IEEE assignment
- 20:31:8D → Giax GmbH (MA-L) [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv line 457); maclookup.app
- Registry / block size
- MA-L (24-bit OUI, ~16M addresses); present in oui.csv only, not mam.csv or oui36.csv — confirms a standard 24-bit block [Confirmed] — IEEE MA-L (oui.csv / mam.csv / oui36.csv)
- HQ / country
- Am Weichselgarten 7, 91058 Erlangen, Germany (DE) [Confirmed] — IEEE MA-L registry address; maclookup.app
- Company status
- active [Confirmed] — giax.de
- Registration date
- Unknown — IEEE publishes NO assignment/registration date for OUI blocks. maclookup.app shows July 23, 2022, but that is a third-party database artifact, not an IEEE fact; left null. [Unknown] — maclookup.app (artifact, not recorded)
- Device types
- broadband access networking equipment for coax and fiber — HelEOS access nodes (10G Ethernet over coax; DAA, Remote PHY/Remote MAC-PHY, mobile backhaul, distributed PON/FTTX), IRIS network controllers (1–24 RF ports) and CPE/modems/HomeNet WLAN gateways (MoCA Access gigabit-over-coax), Atlas hardened distributed PON [Confirmed] — giax.de/en/products/heleos, giax.de/en/about-giax
- Deployment context
- ISP/MDU access infrastructure and subscriber CPE; operator deployments include Vodafone Deutschland (HelEOS) and German regional ISPs (RegioNet Schweinfurt, Stadtwerke Bad Nauheim, Talk Straight); North American distribution via Antronix. Not sold through consumer retail channels. [Confirmed] — giax.de news; prweb.com (Antronix agreement)
- Security context
- no published CVEs or public security advisories found as of June 2026; devices are ISP-grade access nodes/controllers/CPE, so attack surface is relevant to cable-operator network environments rather than mass-market consumer hardware. [Likely] — cvedetails.com, nvd.nist.gov (no hits)
- Website
- https://www.giax.de/en/ [Confirmed] — giax.de
- Analyst note
- a 20:31:8D MAC most likely identifies a cable/coax broadband subscriber device or an ISP access node in a German/European network, not a generic consumer router.