Active Silicon Ltd — MAC Prefix 00:05:91

A MAC address beginning 00:05:91 matches an IEEE MA-L assignment to Active Silicon Ltd; it does not by itself identify a device model or show that the address is in current use. The supplied company material describes Active Silicon as a manufacturer of imaging products and embedded vision systems, but does not map any product or device category to this prefix.

The assignment is 24 bits long, leaving 24 suffix bits: 16,777,216 possible suffix values. This is an arithmetic address space, not a count of devices, shipments, or observed traffic. In 00, the first-byte Group bit (01) and Local bit (02) are both zero. Those bit values are fixed for an exact 00:05:91 prefix; changing either produces a different prefix. RFC 7042 describes these bits and the structure of 48-bit MAC identifiers.

For identification, compare the captured address's first three octets with 00:05:91. A match supports the registry assignment only; it cannot establish a particular product, operating system, present-day corporate identity, or security state. The supplied company profile says Active Silicon was founded in 1988 and is part of Solid State plc's Steatite systems division.

Registry assignment

Active Silicon Ltd — MA-L 00:05:91 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Device identification

No device category is mapped to this exact prefix in the supplied evidence [Unknown] — https://www.activesilicon.com/company/about-us/

Registry

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

Company

Active Silicon Ltd [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Prefixes

00:05:91 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv

Total prefix count

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

Industry

Imaging products and embedded vision systems [Confirmed] — https://www.activesilicon.com/company/about-us/

Notable products

Cameras, camera electronics, frame grabbers, and embedded systems [Confirmed] — https://www.activesilicon.com/company/about-us/

Related vendors

Solid State plc; Steatite Ltd [Confirmed] — https://www.activesilicon.com/company/about-us/

Website

https://www.activesilicon.com/company/about-us/ [Confirmed] — https://www.activesilicon.com/terms-of-use/

Organization status

Active Silicon Ltd is identified as registered in England [Confirmed] — https://www.activesilicon.com/terms-of-use/

Country

United Kingdom [Confirmed] — https://www.activesilicon.com/company/about-us/

Device types

Unknown [Unknown] — https://www.activesilicon.com/company/about-us/