Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4PMA callsign genealogy
Currently held by DEIFENDERFER, HAROLD C
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 W4PMA's current licensee, walking backwards.
- Fielding, Michael BFLgranted 2022-05-10cancelled 2022-05-28
Successor callsigns
Callsigns held now by people who previously held W4PMA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4PMA, oldest first.
- DEIFENDERFER, HAROLD C AL1996-01-30 → cancelled 2008-01-31
- Fielding, Michael B MO2022-05-28 active