Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA9PZP callsign genealogy
Currently held by KOELM, JOHN W
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 KA9PZP's current licensee, walking backwards.
- Koelm, Walter RKYgranted 2020-05-05cancelled 2020-05-27
Successor callsigns
Callsigns held now by people who previously held KA9PZP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA9PZP, oldest first.
- KOELM, JOHN W IN1990-05-15 → cancelled 2002-05-16
- Koelm, Walter R KY2020-05-27 active