Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD4DTX callsign genealogy
Currently held by MASON, BRAD R
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 KD4DTX's current licensee, walking backwards.
- Kadlubowski, Christopher AMIgranted 2014-06-25cancelled 2015-10-02
Successor callsigns
Callsigns held now by people who previously held KD4DTX.
- Kadlubowski, Christopher AINgranted 2018-12-14cancelled 2019-05-24
All historical holders
Every license row we've seen with the callsign KD4DTX, oldest first.
- MASON, BRAD R GA2001-11-07 → cancelled 2014-02-05
- Kadlubowski, Christopher A IN2015-10-02 → cancelled 2018-12-14