Adolf Tedsen GmbH & Co. KG — MAC prefix identifies an IEEE registry assignment
Summary
- // what this is
- Adolf Tedsen GmbH & Co. KG is registered to MAC prefix
80:42:7Cin the IEEE OUI database. When a device's MAC address begins with80:42:7C, that block was registered by Adolf Tedsen GmbH & Co. KG — the OUI identifies the maker of the network hardware, which is not always the brand on the device. - // analyst note
- The 24-bit prefix fixes the first-octet Group and Local bits at 0 and 0. A matching 48-bit address has 24 suffix bits, allowing 16,777,216 possible suffix values; this is not an actual device or shipment count. A prefix match indicates registry assignment only.
About this vendor.
A MAC address beginning 80:42:7C matches an IEEE MA-L assignment to Adolf Tedsen GmbH & Co. KG; the assignment does not identify a device type or product. The IEEE record indicates Germany, but provides no evidence here about the company’s products, industry, or current legal identity beyond the listed registrant name.
This is a 24-bit prefix, so a matching 48-bit address has 24 remaining bits and 16,777,216 possible suffix values. That is a mathematical range, not a count of devices made, deployed, or observed. The match establishes that the address begins with the assigned prefix; it cannot by itself identify a particular device, operating system, traffic prevalence, or security state.
The first octet 80 has Group and Local bits both clear: Group bit 0 and Local bit 0. These bits are fixed for this exact prefix. Changing either bit produces a different prefix; it does not describe variation within 80:42:7C. RFC 7042 explains the structure of 48-bit MAC identifiers and these bit meanings.
- Registry match
80:42:7Cis assigned to Adolf Tedsen GmbH & Co. KG in the IEEE MA-L registry. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Device type
- Unknown; the assignment record does not specify a device category. [Unknown]
- Country
- Germany, indicated by
DEin the IEEE record. [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Company
- Adolf Tedsen GmbH & Co. KG [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Registry
- MA-L [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Prefix
80:42:7C[Confirmed] — https://standards-oui.ieee.org/oui/oui.csv- Country
- Germany [Confirmed] — https://standards-oui.ieee.org/oui/oui.csv
- Assignment date
- Unavailable in this IEEE CSV record. [Unknown] — https://standards-oui.ieee.org/oui/oui.csv