Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4LL callsign genealogy
Currently held by BLACK, JOHN O
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 KD4LL's current licensee, walking backwards.
- DAVIS, PAUL EFLgranted 2011-02-23cancelled 2011-04-08
Successor callsigns
Callsigns held now by people who previously held KD4LL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4LL, oldest first.
- BLACK, JOHN O AL1996-02-05 → cancelled 2008-02-06
- DAVIS, PAUL E FL2021-03-11 active