Runtop, Inc. MAC prefixes: vendor identified, device unknown
Summary
- // what this is
- Runtop is registered to MAC prefix
00:03:6Dand 1 more in the IEEE OUI database. When a device's MAC address begins with00:03:6D, that block was registered by Runtop — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- Each exact 24-bit prefix leaves 24 suffix bits, or 16,777,216 possible suffix values; this is not a device or shipment count. Both prefixes start with 00, so their Group and Local bits are 0. A captured match establishes the registered prefix assignment only, not a particular device or security state.
About this vendor.
A MAC address beginning 00:03:6D or 00:20:78 matches an IEEE MA-L assignment registered to Runtop, Inc.; the assignment does not identify a device category. The supplied IEEE record lists the legal name for both prefixes, with capitalization variants, and RFC 7042 describes how 48-bit MAC identifiers use an assigned prefix followed by additional bits.
Both prefixes are 24 bits long, leaving 24 bits after the prefix. Each therefore has 16,777,216 possible suffix values. That is a count of possible values, not a count of observed devices, shipments, or deployed addresses. For both exact prefixes, the first octet is 00: Group bit 0 means the group/multicast bit is clear, and Local bit 0 means the locally administered bit is clear. Either bit changing produces a different prefix.
A captured address that matches one of these prefixes supports a registry-assignment match only. It cannot establish the specific device, product, current vendor identity, usage prevalence, or security status. Assignment dates are unavailable in these IEEE CSV records.
- Identification
00:03:6Dand00:20:78are registered to Runtop, Inc.; device category is not established. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Registry
- MA-L, with two assigned prefixes. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Address interpretation
- Both are 24-bit prefixes with 24 suffix bits; Group and Local bits in the first octet are both 0. [Confirmed] — https://www.rfc-editor.org/rfc/rfc7042.txt