SeaMicro Inc. MAC prefix identification
Summary
- // what this is
- SeaMicro is registered to MAC prefix
00:21:53and 1 more in the IEEE OUI database. When a device's MAC address begins with00:21:53, that block was registered by SeaMicro — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- Each listed 24-bit prefix leaves 24 suffix bits, or 16,777,216 possible suffix values. The Group bit is 0 and the Local bit is 0 for both exact prefixes. These bit values are fixed for a literal prefix match; changing either bit yields a different prefix. Suffix-space size does not indicate device or shipment count. A match indicates an IEEE registry assignment, not a particular device or deployment.
About this vendor.
A MAC address beginning 00:21:53 or 00:22:99 matches an IEEE MA-L assignment registered to SeaMicro Inc.; the records do not identify a device type or product for either prefix. A match establishes the registered prefix only, not the identity, location, or current status of a particular device.
Both are 24-bit prefixes, leaving 24 bits for suffix values. Each therefore has 16,777,216 possible suffix values; that is a mathematical address-space size, not a count of devices or shipments. In both prefixes, the first-byte Group and Local bits are zero. Changing either bit changes the prefix and is not variation within these exact assignments.
RFC 7042 explains that 48-bit MAC identifiers can use an initial OUI followed by additional bits, and describes the Group and Local bits. IEEE records two assignments under the registered organization name SeaMicro Inc. Product and industry identification remain unknown.
- Device type
- Unknown; the records do not map either prefix to a device category [Unknown] — https://standards-oui.ieee.org/oui/oui.csv