Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9RTF callsign genealogy
Currently held by WERMES SR, FRANK
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 K9RTF's current licensee, walking backwards.
- FIELDS, RANDALL TINgranted 2017-05-02cancelled 2017-05-27
Successor callsigns
Callsigns held now by people who previously held K9RTF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9RTF, oldest first.
- WERMES SR, FRANK WI1996-08-08 → cancelled 2008-08-09
- FIELDS, RANDALL T IN2017-05-27 active