Siemens Home & Office Comm. Devices — 3 prefixes (MA-L)

A MAC address beginning with 00:13:A3, 00:0B:23, or 00:18:D1 belongs to Siemens Home & Office Comm. Devices, the Dallas, Texas-based unit that built Siemens' cordless and DECT telephone hardware before it was divested in 2008. These three MA-L blocks are the vendor's entire IEEE footprint — no MA-M or MA-S sub-allocations exist under this name.

The unit was formally established as Siemens Home and Office Communication Devices GmbH & Co KG on 2005-10-01, spun out of Siemens AG's telephone business. On 2008-10-01, Arques Industries AG acquired it for roughly EUR45 million and renamed the combined operation Gigaset; the business continued as Gigaset Communications GmbH, which VTech's Snom subsidiary later acquired in April 2024.

Hardware registered under these three prefixes is cordless and corded telephones, DECT handsets and base stations, and answering machines — the analog and early-digital consumer telephony line Siemens sold under its own name before the Gigaset rebrand. The Gigaset successor brand later expanded into VoIP phones, WLAN DSL gateways, and WLAN cameras, none of which trace back to these specific OUI blocks.

No CVE ties directly to hardware registered under these three blocks. The Gigaset successor brand carries documented default-credential issues on later WLAN-connected products (a WLAN camera and a WLAN DSL gateway), which is brand-lineage context for the corporate successor, not a confirmed defect of the pre-2008 telephony hardware these prefixes cover.

IEEE assignment

3 MA-L prefixes (00:13:A3, 00:0B:23, 00:18:D1) → Siemens Home & Office Comm. Devices, Dallas, TX [Confirmed] — the IEEE MA-L registry 0013A3, 000B23, 0018D1

Registry / block size

MA-L (24-bit OUI) x3; no MA-M or MA-S entries found for this registrant name [Confirmed] — grep across the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

HQ / address

4849 Alpha Road, Dallas, TX 75244, US (one registry row lists 74244 and minor formatting variants — likely IEEE data-entry inconsistency, not a second address) [Confirmed] — the IEEE MA-L registry 0013A3, 000B23, 0018D1

Company status

dissolved/absorbed — sold to Arques Industries AG on 2008-10-01 for ~EUR45M, renamed Gigaset; continued as Gigaset Communications GmbH; Gigaset acquired by VTech's Snom subsidiary in April 2024 [Confirmed] — https://en.wikipedia.org/wiki/Gigaset_Communications, https://www.uctoday.com/devices-workspace-tech/gigaset-former-siemens-home-office-communication-devices/

Corporate founding

established as Siemens Home and Office Communication Devices GmbH & Co KG on 2005-10-01, spun off from Siemens AG's telephone business [Likely] — https://networkheadlines.com/gigaset-company-history/, https://www.uctoday.com/devices-workspace-tech/gigaset-former-siemens-home-office-communication-devices/

Device types

cordless/corded telephones, DECT handsets and base stations, answering machines [Confirmed] — https://en.wikipedia.org/wiki/Gigaset_Communications

Successor device types (Gigaset brand, not these specific blocks)

VoIP phones, WLAN DSL gateways, WLAN cameras [Likely] — https://en.wikipedia.org/wiki/Gigaset_Communications

Registration date

Unknown — IEEE's public OUI data (the IEEE MA-L registry: Registry, Assignment, Organization Name, Organization Address) publishes no assignment date; any third-party "date registered" is a database artifact, not an IEEE fact [Confirmed]

Security context

no CVE found tied specifically to hardware under these three OUI blocks; the corporate-successor Gigaset brand has documented default-credential issues on later WLAN-connected products — CVE-2008-6993 (Gigaset WLAN Camera v1.27, default password; NVD notes third-party/unconfirmed provenance) and independently reported default-credential issues on the Gigaset SX762 WLAN DSL Gateway and gigaset-config.com (default PIN). Framed as brand-lineage context for the post-2008 successor, not a confirmed defect of these three pre-rebrand blocks [Likely] — https://nvd.nist.gov/vuln/detail/CVE-2008-6993, https://dariusfreamon.wordpress.com/2013/10/03/siemens-gigaset-lanphone-gateway-default-password/, https://www.isssource.com/siemens-default-password-vulnerability/

Shared base status

not applicable — all three prefixes are direct vendor-specific MA-L registrations, none are sub-allocations of a shared IEEE base such as 70:B3:D5 or 8C:1F:64 [Confirmed] — registry analysis of the IEEE MA-L registry 0013A3, 000B23, 0018D1

Corroboration

Florida SunBiz corporate registration under the same entity name; a present-day Siemens Enterprise Networks listing at the identical Dallas street address [Confirmed] — https://search.sunbiz.org/Inquiry/corporationsearch/SearchResultDetail?inquirytype=EntityName&directionType=PreviousList&searchNameOrder=SIEMENSHOMEOFFICECOMMUNICATION+M060000011610&aggregateId=forl-m06000001161-4b29eeb8-aa8f-4c14-983f-64492c3b5262&listNameOrder=SIEMENSHOLDINGS+L120000277970, https://www.yelp.com/biz/siemens-enterprise-networks-dallas

Related vendors

Gigaset Communications GmbH (corporate successor); Siemens AG (parent at founding)

Analyst note

three co-located MA-L blocks at one Dallas address plus a documented divestiture history (Siemens → standalone GmbH & Co KG 2005 → Arques/Gigaset 2008 → VTech/Snom 2024) establish this as a legitimate legacy vendor entry, not a bare-registration shell; treat WLAN-connected default-credential reports as Gigaset brand-lineage context, not a confirmed defect of hardware under these three specific pre-2008 blocks.