Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD4JNJ callsign genealogy
Currently held by Rowell, Jeffrey T
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 KD4JNJ's current licensee, walking backwards.
- Rowell, Jeffrey TALgranted 2014-06-23cancelled 2014-09-03
Successor callsigns
Callsigns held now by people who previously held KD4JNJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4JNJ, oldest first.
- ROWELL, JEFFREY T AL1992-01-28 → cancelled 2004-01-29
- Rowell, Jeffrey T AL2024-08-17 active