Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4CMP callsign genealogy
Currently held by Leffler, Charles 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 WA4CMP's current licensee, walking backwards.
- Leffler, Charles DKYgranted 2021-01-12cancelled 2021-01-30
Successor callsigns
Callsigns held now by people who previously held WA4CMP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA4CMP, oldest first.
- LEFFLER, CHARLES D KY1991-07-30 → cancelled 2003-07-31
- Leffler, Charles D KY2021-01-30 active