Confidence: Medium · Source: FCC ULS · As of 2026-09-11
K4FST callsign genealogy
Currently held by Humphreys, James J
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 K4FST's current licensee, walking backwards.
- Humphreys, James JTNgranted 2021-03-12cancelled 2021-04-23
Successor callsigns
Callsigns held now by people who previously held K4FST.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4FST, oldest first.
- TROXLER, FLAVIAN S TN2008-03-25 → cancelled 2020-03-26
- Humphreys, James J TN2021-04-23 active