Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9KFB callsign genealogy
Currently held by Cox, Ronald W
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by W9KFB's current licensee, walking backwards.
- Mueller, Matthew AWIgranted 2023-08-01cancelled 2023-09-12
Successor callsigns
Callsigns held now by people who previously held W9KFB.
- Cox, Ronald WCOgranted 2019-02-20
All historical holders
Every license row we've seen with the callsign W9KFB, oldest first.
- Cox, Ronald W CO2010-09-09 → cancelled 2019-02-20
- MUELLER, MATTHEW M WI2023-09-12 active