Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4FDM callsign genealogy
Currently held by Clark Jr, William 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 KM4FDM's current licensee, walking backwards.
- Cash, Michael TVAgranted 2019-06-12cancelled 2019-07-13
Successor callsigns
Callsigns held now by people who previously held KM4FDM.
- CLARK JR, WILLIAM DGAgranted 2014-12-05cancelled 2019-05-21
All historical holders
Every license row we've seen with the callsign KM4FDM, oldest first.
- Clark Jr, William D GA2014-10-22 → cancelled 2014-12-05
- Cash, Michael T VA2019-07-13 active