A4SP Technologies Ltd. — MAC prefix identifies an IEEE registry assignment
Summary
- // what this is
- A4SP Technologies is registered to MAC prefix
00:21:FAin the IEEE OUI database. When a device's MAC address begins with00:21:FA, that block was registered by A4SP Technologies — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- A 24-bit prefix match leaves 24 suffix bits, corresponding to 16,777,216 possible suffix values; this is not an observed device or shipment count. For the exact prefix 00:21:FA, the first-byte Group bit and Local bit are both zero. Changing either bit yields a different prefix. RFC 7042 describes these MAC identifier bits and prefix structure. A match indicates the registry assignment, not a particular device or deployment.
About this vendor.
A MAC address beginning 00:21:FA matches an IEEE assignment registered to A4SP Technologies Ltd.; the record does not identify a device type or product. The IEEE CSV lists one MA-L assignment, 00:21:FA, and identifies the registrant’s country as Finland. It provides no assignment date in this record.
The prefix is 24 bits long, leaving 24 bits for suffix values—16,777,216 possible values. This is an address-space calculation, not a count of devices, shipments, or addresses observed in use. The first byte is 00: its Group bit and Local bit are both zero for this exact literal prefix. Changing either bit changes the prefix, so the values describe this assignment’s matching boundary; they do not describe variation within it.
A match supports the registry association only. It cannot establish which device made a capture, whether the address is deployed or prevalent, or the device’s operating system or security state. RFC 7042 explains the structure of 48-bit MAC identifiers and the significance of the Group and Local bits.
- Registry match
00:21:FAis assigned to A4SP Technologies Ltd. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Device identification
- The registry record does not specify a device category or product. [Unknown] — https://standards-oui.ieee.org/oui/oui.csv
- Assignment size
- One MA-L prefix; 24 suffix bits allow 16,777,216 possible suffix values. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Country
- Finland is indicated by
FIin the retrieved registry record. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Company
- A4SP Technologies Ltd. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Registry
- MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefixes
00:21:FA[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Total prefix count
- 1 [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Country
- Finland [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Device types
- Unknown [Unknown] — https://standards-oui.ieee.org/oui/oui.csv