Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4PY callsign genealogy
Currently held by Crisp III, James D
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 KD4PY's current licensee, walking backwards.
- Crisp III, James DFLgranted 2013-08-09cancelled 2020-07-21
Successor callsigns
Callsigns held now by people who previously held KD4PY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4PY, oldest first.
- Crisp Jr, James D FL2002-12-17 → cancelled 2015-02-24
- Crisp III, James D FL2020-07-21 active