Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4FSK callsign genealogy
Currently held by Kersten, Frank S
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 K4FSK's current licensee, walking backwards.
- TAYLOR, JONATHAN RFLgranted 2024-11-14cancelled 2024-12-07
Successor callsigns
Callsigns held now by people who previously held K4FSK.
- Kersten, Frank SFLgranted 2021-09-17cancelled 2024-12-24
All historical holders
Every license row we've seen with the callsign K4FSK, oldest first.
- SORAH, JAMES C TN1993-10-05 → cancelled 1998-10-16
- Kersten, Frank S FL2020-11-21 → cancelled 2021-09-17
- TAYLOR, JONATHAN R FL2024-12-07 active