Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KG4P callsign genealogy
Currently held by RIERSON, JOSHUA M
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 KG4P's current licensee, walking backwards.
- RIERSON, JOSHUA MNCgranted 2024-01-23cancelled 2026-01-16
Successor callsigns
Callsigns held now by people who previously held KG4P.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KG4P, oldest first.
- CASTO, JAMES PA2013-08-08 → cancelled 2024-02-06
- RIERSON, JOSHUA M NC2026-01-16 active