VIA TECHNOLOGIES, INC. MAC prefix assignments
Summary
- // what this is
- VIA Technologies is registered to MAC prefix
00:40:63and 1 more in the IEEE OUI database. When a device's MAC address begins with00:40:63, that block was registered by VIA Technologies — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- A matching prefix indicates an IEEE registry assignment and does not establish a specific device, deployment, or product mapping.
About this vendor.
The IEEE registry lists the MA-L prefixes 00:40:63 and 00:1F:F2 under VIA TECHNOLOGIES, INC. (with a capitalization variant in the second entry). These assignments indicate registry allocation only; they do not identify a particular device or product.
Both prefixes are 24 bits long, leaving 24 bits for suffix values. Their first byte is 00: the Group bit and Local bit are both zero. The exact prefix match therefore has those bits fixed; changing either bit produces a different prefix. Each assignment allows 16,777,216 possible suffix values, a mathematical range rather than a count of devices or shipments.
RFC 7042 describes 48-bit MAC identifiers as an initial assigned prefix followed by additional bits, and explains the Group and Local bits. A matching prefix can help identify the registry assignment in a captured address, but does not establish deployment, traffic prevalence, current vendor identity, or safety. Assignment dates are unavailable in these IEEE CSV records.
- Matching prefixes
00:40:63and00:1F:F2, each a 24-bit MA-L prefix [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Address interpretation
- Group bit 0 and Local bit 0 in the first byte of each prefix; each leaves 24 suffix bits [Confirmed] — https://www.rfc-editor.org/rfc/rfc7042.txt