Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4FTF callsign genealogy
Currently held by GUTHRIE, 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 K4FTF's current licensee, walking backwards.
- GUTHRIE, JOHN CTNgranted 2017-10-03cancelled 2020-04-21
Successor callsigns
Callsigns held now by people who previously held K4FTF.
No current licensee on record previously held this callsign.