Westermo Network Technologies AB MAC Prefixes: Registry Assignment

A MAC address beginning with one of these prefixes matches an IEEE MA-L assignment recorded to Westermo Network Technologies AB; it does not identify a particular device or product. The three listed prefixes are B4:56:F3, 00:07:7C, and 00:11:B4, each covering the first 24 bits of a 48-bit address.

Westermo’s published material describes industrial Ethernet hardware and software, including WeOS, its operating system. The company also identifies Ethernet switches and routers for rail and critical infrastructure applications. The supplied material does not map any of those products to these prefixes.

For each exact prefix, the first-byte Group and Local bits are both zero. Under RFC 7042’s address-format guidance, those bits distinguish group and local indications; changing either bit changes the prefix and no longer matches the listed assignment. Each 24-bit prefix leaves 24 suffix bits, or 16,777,216 possible suffix values. That is a mathematical address-space count, not a device or shipment count.

Registry match

IEEE lists all three prefixes under Westermo Network Technologies AB in the MA-L registry. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Identification limit

The prefix match indicates the registry assignment; the captured address alone does not establish a specific device or product. [Likely] — https://www.rfc-editor.org/rfc/rfc7042.txt

Company

Westermo Network Technologies AB [Confirmed] — https://www.westermo.com/legal-notice

Registry

MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Prefixes

B4:56:F3, 00:07:7C, 00:11:B4 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Assignment count

3 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Country

Sweden [Confirmed] — https://www.westermo.com/legal-notice

Parent company

Ependion AB [Confirmed] — https://www.westermo.com/legal-notice

Industry

Industrial networking and data communications [Confirmed] — https://www.westermo.com/news-and-events/news/2018-09-21-westermo-network-technologies

Notable products and technology

WeOS, Ethernet switches and routers, and switch-based intrusion detection [Confirmed] — https://www.westermo.com/; https://www.westermo.com/news-and-events/news/2018-09-21-westermo-network-technologies

Historical name change

Westermo Teleindustri AB changed its name to Westermo Network Technologies AB. [Confirmed] — https://www.westermo.com/news-and-events/news/2018-09-21-westermo-network-technologies

Assignment dates

Assignment dates are unavailable in these IEEE CSV records. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv