Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4DPJ callsign genealogy
Currently held by CROWLEY, JOHN M
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 K4DPJ's current licensee, walking backwards.
- CROWLEY, JOHN MNCgranted 2017-07-24cancelled 2017-12-05
Successor callsigns
Callsigns held now by people who previously held K4DPJ.
- LUSEN, FREDERICK GTXgranted 2026-09-04