Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4JAK callsign genealogy
Currently held by Thornburg, Jack A
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 K4JAK's current licensee, walking backwards.
- Thornburg, Jack AFLgranted 2008-08-21cancelled 2009-03-27
Successor callsigns
Callsigns held now by people who previously held K4JAK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JAK, oldest first.
- DE VERE JR, PRINCHAS N NC1997-02-04 → cancelled 2009-02-05
- Thornburg, Jack A FL2019-01-30 active