Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4PM callsign genealogy
Currently held by Defant, John 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 WA4PM's current licensee, walking backwards.
- Defant, John CFLgranted 2020-10-06cancelled 2026-07-24
Successor callsigns
Callsigns held now by people who previously held WA4PM.
- MARTIN, PATRICK CFLgranted 2024-02-03
All historical holders
Every license row we've seen with the callsign WA4PM, oldest first.
- MARTIN, PATRICK C FL2020-04-21 → cancelled 2024-02-03
- Defant, John C FL2026-07-24 active